[experiment] Set never type fallback = `!` by WaffleLapkin · Pull Request #123482 · rust-lang/rust

WaffleLapkin · 2024-04-05T00:08:31Z

Tracking:

Tracking Issue for Rust 2024: Make ! fall back to ! #123748

rust-log-analyzer · 2024-04-05T00:25:41Z

The job x86_64-gnu-llvm-17 failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

#16 exporting to docker image format
#16 sending tarball 29.5s done
#16 DONE 41.0s
##[endgroup]
Setting extra environment values for docker:  --env ENABLE_GCC_CODEGEN=1 --env GCC_EXEC_PREFIX=/usr/lib/gcc/
[CI_JOB_NAME=x86_64-gnu-llvm-17]
---
sccache: Starting the server...
##[group]Configure the build
configure: processing command line
configure: 
configure: build.configure-args := ['--build=x86_64-unknown-linux-gnu', '--llvm-root=/usr/lib/llvm-17', '--enable-llvm-link-shared', '--set', 'rust.thin-lto-import-instr-limit=10', '--set', 'change-id=99999999', '--enable-verbose-configure', '--enable-sccache', '--disable-manage-submodules', '--enable-locked-deps', '--enable-cargo-native-static', '--set', 'rust.codegen-units-std=1', '--set', 'dist.compression-profile=balanced', '--dist-compression-formats=xz', '--disable-dist-src', '--release-channel=nightly', '--enable-debug-assertions', '--enable-overflow-checks', '--enable-llvm-assertions', '--set', 'rust.verify-llvm-ir', '--set', 'rust.codegen-backends=llvm,cranelift,gcc', '--set', 'llvm.static-libstdcpp', '--enable-new-symbol-mangling']
configure: target.x86_64-unknown-linux-gnu.llvm-config := /usr/lib/llvm-17/bin/llvm-config
configure: llvm.link-shared     := True
configure: rust.thin-lto-import-instr-limit := 10
configure: change-id            := 99999999
---

---- [ui] tests/ui/associated-types/associated-types-ICE-when-projecting-out-of-err.rs stdout ----
diff of stderr:

- error[E0277]: the trait bound `(): Add<A>` is not satisfied
+ error[E0277]: the trait bound `!: Add<A>` is not satisfied
3    |
3    |
4 LL |     r = r + a;

-    |           ^ the trait `Add<A>` is not implemented for `()`
+    |           ^ the trait `Add<A>` is not implemented for `!`
7 help: this trait has no implementations, consider adding one
8   --> $DIR/associated-types-ICE-when-projecting-out-of-err.rs:15:1


---
status: exit status: 1
command: RUSTC_ICE="0" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/associated-types/associated-types-ICE-when-projecting-out-of-err.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/associated-types/associated-types-ICE-when-projecting-out-of-err" "-A" "unused" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/associated-types/associated-types-ICE-when-projecting-out-of-err/auxiliary"
stdout: none
--- stderr -------------------------------
error[E0277]: the trait bound `!: Add<A>` is not satisfied
   |
   |
LL |     r = r + a;
   |           ^ the trait `Add<A>` is not implemented for `!`
help: this trait has no implementations, consider adding one
  --> /checkout/tests/ui/associated-types/associated-types-ICE-when-projecting-out-of-err.rs:15:1
   |
   |
LL | trait Add<RHS=Self> {

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0277`.
---

error[E0282]: type annotations needed
##[error]  --> /checkout/tests/ui/async-await/async-error-span.rs:13:9
   |
LL |     let a; //~ ERROR type annotations needed
   |
   |
help: consider giving `a` an explicit type
   |
LL |     let a: /* Type */; //~ ERROR type annotations needed

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0277, E0282.
Some errors have detailed explanations: E0277, E0282.
For more information about an error, try `rustc --explain E0277`.
------------------------------------------


---- [ui] tests/ui/coercion/coerce-issue-49593-box-never.rs#nofallback stdout ----

error in revision `nofallback`: ui test compiled successfully!
status: exit status: 0
command: RUSTC_ICE="0" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/coercion/coerce-issue-49593-box-never.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "--cfg" "nofallback" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/coercion/coerce-issue-49593-box-never.nofallback" "-A" "unused" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/coercion/coerce-issue-49593-box-never.nofallback/auxiliary"
stderr: none


---- [ui] tests/ui/consts/try-operator.rs stdout ----
---- [ui] tests/ui/consts/try-operator.rs stdout ----
diff of stderr:

4 LL | #![feature(const_convert)]
5    |            ^^^^^^^^^^^^^
6 
- error[E0015]: `?` cannot determine the branch of `Result<(), ()>` in constant functions
+ error[E0015]: `?` cannot determine the branch of `Result<!, ()>` in constant functions
9    |
10 LL |         Err(())?;


32 LL + #![feature(effects)]
34 
34 
- error[E0015]: `?` cannot determine the branch of `Option<()>` in constant functions
+ error[E0015]: `?` cannot determine the branch of `Option<!>` in constant functions
37    |
38 LL |         None?;


---
   |
LL | #![feature(const_convert)]
   |            ^^^^^^^^^^^^^

error[E0015]: `?` cannot determine the branch of `Result<!, ()>` in constant functions
   |
LL |         Err(())?;
   |         ^^^^^^^^
   |
   |
note: impl defined here, but it is not `const`
  --> /rustc/FAKE_PREFIX/library/core/src/result.rs:1940:1
   = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants
help: add `#![feature(effects)]` to the crate attributes to enable
   |
LL + #![feature(effects)]


error[E0015]: `?` cannot convert from residual of `Result<bool, ()>` in constant functions
   |
LL |         Err(())?;
   |         ^^^^^^^^
   |
   |
note: impl defined here, but it is not `const`
  --> /rustc/FAKE_PREFIX/library/core/src/result.rs:1959:1
   = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants
help: add `#![feature(effects)]` to the crate attributes to enable
   |
LL + #![feature(effects)]


error[E0015]: `?` cannot determine the branch of `Option<!>` in constant functions
   |
LL |         None?;
   |         ^^^^^
   |
   |
note: impl defined here, but it is not `const`
  --> /rustc/FAKE_PREFIX/library/core/src/option.rs:2443:1
   = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants
help: add `#![feature(effects)]` to the crate attributes to enable
   |
LL + #![feature(effects)]


error[E0015]: `?` cannot convert from residual of `Option<()>` in constant functions
   |
LL |         None?;
   |         ^^^^^
   |
   |
note: impl defined here, but it is not `const`
  --> /rustc/FAKE_PREFIX/library/core/src/option.rs:2462:1
   = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants
help: add `#![feature(effects)]` to the crate attributes to enable
   |
LL + #![feature(effects)]

error: aborting due to 5 previous errors

Some errors have detailed explanations: E0015, E0635.
---

124 LL |     reuse to_reuse::opaque_ret;
125    |                     ^^^^^^^^^^
126 
+ error[E0277]: the trait bound `!: opaque::Trait` is not satisfied
+    |
+    |
+ LL |         pub fn opaque_ret() -> impl Trait { unimplemented!() }
+    |                                ^^^^^^^^^^ the trait `opaque::Trait` is not implemented for `!`
+    = help: the trait `opaque::Trait` is implemented for `()`
+    = help: the trait `opaque::Trait` is implemented for `()`
+    = note: this error might have been caused by changes to Rust's type-inference algorithm (see issue #48950 <https://github.com/rust-lang/rust/issues/48950> for more information)
+    = help: did you intend to use the type `()` here instead?
127 error: delegation to unsafe functions is not supported yet
128   --> $DIR/not-supported.rs:88:21
129    |

---
status: exit status: 1
command: RUSTC_ICE="0" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/delegation/not-supported.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/delegation/not-supported" "-A" "unused" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/delegation/not-supported/auxiliary"
stdout: none
--- stderr -------------------------------
error: delegation with early bound generics is not supported yet
   |
   |
LL |         fn bar(&self, x: T) -> T { x }
   |         ------------------------ callee defined here
LL |         reuse GenericTrait::bar;
   |                             ^^^


error: delegation with early bound generics is not supported yet
   |
LL |         fn bar1() {}
   |         --------- callee defined here
...
...
LL |         reuse GenericTrait::bar1;
   |                             ^^^^

error: delegation with early bound generics is not supported yet
   |
   |
LL |         fn bar(&self, x: T) -> T { x }
   |         ------------------------ callee defined here
...
LL |         reuse <F as GenericTrait<T>>::bar { &self.0 }


error: delegation with early bound generics is not supported yet
   |
LL |         fn bar1() {}
   |         --------- callee defined here
...
...
LL |         reuse GenericTrait::<T>::bar1;
   |                                  ^^^^

error: delegation with early bound generics is not supported yet
   |
   |
LL |         fn bar(&self, x: T) -> T { x }
   |         ------------------------ callee defined here
...
LL |         reuse GenericTrait::bar { &F }


error: delegation with early bound generics is not supported yet
   |
LL |         fn bar1() {}
   |         --------- callee defined here
...
...
LL |         reuse GenericTrait::bar1;
   |                             ^^^^

error: delegation with early bound generics is not supported yet
   |
   |
LL |         fn foo(&self, x: i32) -> i32 { x }
   |         ---------------------------- callee defined here
LL |         reuse Trait::foo;
   |                      ^^^


error[E0049]: method `foo2` has 0 type parameters but its trait declaration has 1 type parameter
   |
   |
LL |         fn foo2<T>(&self, x: T) -> T { x }
   |                 - expected 1 type parameter
LL |         reuse Trait::foo2 { &self.0 }
   |                      ^^^^ found 0 type parameters


error: delegation with early bound generics is not supported yet
   |
   |
LL |         fn foo3<'a: 'a>(_: &'a u32) {}
   |         --------------------------- callee defined here
...
LL |         reuse <F as Trait>::foo3;


error[E0195]: lifetime parameters or bounds on method `foo3` do not match the trait declaration
   |
   |
LL |         fn foo3<'a: 'a>(_: &'a u32) {}
   |                -------- lifetimes in impl do not match this method in trait
...
LL |         reuse <F as Trait>::foo3;
   |                             ^^^^ lifetimes do not match method in trait

error: delegation with early bound generics is not supported yet
   |
   |
LL |         fn foo(&self, x: i32) -> i32 { x }
   |         ---------------------------- callee defined here
LL |         reuse Trait::foo { &self.0 }
   |                      ^^^


error: delegation with early bound generics is not supported yet
   |
   |
LL |         fn foo2<T>(&self, x: T) -> T { x }
   |         ---------------------------- callee defined here
LL |         reuse Trait::foo2 { &self.0 }
   |                      ^^^^


error: delegation with early bound generics is not supported yet
   |
   |
LL |         pub fn opaque_arg(_: impl Trait) -> i32 { 0 }
   |         --------------------------------------- callee defined here
LL |     reuse to_reuse::opaque_arg;
   |                     ^^^^^^^^^^

error: delegation to a function with opaque type is not supported yet
error: delegation to a function with opaque type is not supported yet
##[error]  --> /checkout/tests/ui/delegation/not-supported.rs:76:21
   |
LL |         pub fn opaque_ret() -> impl Trait { unimplemented!() }
   |         --------------------------------- callee defined here
LL |     reuse to_reuse::opaque_ret;
   |                     ^^^^^^^^^^


error[E0277]: the trait bound `!: opaque::Trait` is not satisfied
   |
   |
LL |         pub fn opaque_ret() -> impl Trait { unimplemented!() }
   |                                ^^^^^^^^^^ the trait `opaque::Trait` is not implemented for `!`
   = help: the trait `opaque::Trait` is implemented for `()`
   = help: the trait `opaque::Trait` is implemented for `()`
   = note: this error might have been caused by changes to Rust's type-inference algorithm (see issue #48950 <https://github.com/rust-lang/rust/issues/48950> for more information)
   = help: did you intend to use the type `()` here instead?
error: delegation to unsafe functions is not supported yet
##[error]  --> /checkout/tests/ui/delegation/not-supported.rs:88:21
   |
LL |         pub unsafe fn unsafe_fn() {}
LL |         pub unsafe fn unsafe_fn() {}
   |         ------------------------- callee defined here
...
LL |     reuse to_reuse::unsafe_fn;
   |                     ^^^^^^^^^

error: delegation to non Rust ABI functions is not supported yet
   |
LL |         pub extern "C" fn extern_fn() {}
   |         ----------------------------- callee defined here
...
...
LL |     reuse to_reuse::extern_fn;
   |                     ^^^^^^^^^

error: delegation to variadic functions is not supported yet
##[error]  --> /checkout/tests/ui/delegation/not-supported.rs:92:21
   |
LL |         pub unsafe extern "C" fn variadic_fn(n: usize, mut args: ...) {}
   |         ------------------------------------------------------------- callee defined here
LL |     reuse to_reuse::variadic_fn;
   |                     ^^^^^^^^^^^

error: delegation to const functions is not supported yet
---

---- [ui] tests/ui/impl-trait/generic-with-implicit-hrtb-without-dyn.rs#edition2021 stdout ----
diff of stderr:

- error[E0277]: the trait bound `(): AsRef<(dyn for<'a> Fn(&'a ()) + 'static)>` is not satisfied
+ error[E0277]: the trait bound `!: AsRef<(dyn for<'a> Fn(&'a ()) + 'static)>` is not satisfied
3    |
3    |
4 LL | fn ice() -> impl AsRef<Fn(&())> {

-    |             ^^^^^^^^^^^^^^^^^^^ the trait `AsRef<(dyn for<'a> Fn(&'a ()) + 'static)>` is not implemented for `()`
+    |             ^^^^^^^^^^^^^^^^^^^ the trait `AsRef<(dyn for<'a> Fn(&'a ()) + 'static)>` is not implemented for `!`
7 error[E0782]: trait objects must include the `dyn` keyword
8   --> $DIR/generic-with-implicit-hrtb-without-dyn.rs:6:24



The actual stderr differed from the expected stderr.
Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/impl-trait/generic-with-implicit-hrtb-without-dyn.edition2021/generic-with-implicit-hrtb-without-dyn.edition2021.stderr
To update references, rerun the tests and pass the `--bless` flag
To only update this specific test, also pass `--test-args impl-trait/generic-with-implicit-hrtb-without-dyn.rs`

error in revision `edition2021`: 1 errors occurred comparing output.
status: exit status: 1
command: RUSTC_ICE="0" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/impl-trait/generic-with-implicit-hrtb-without-dyn.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "--cfg" "edition2021" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/impl-trait/generic-with-implicit-hrtb-without-dyn.edition2021" "-A" "unused" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/impl-trait/generic-with-implicit-hrtb-without-dyn.edition2021/auxiliary" "--edition=2021"
--- stderr -------------------------------
--- stderr -------------------------------
error[E0277]: the trait bound `!: AsRef<(dyn for<'a> Fn(&'a ()) + 'static)>` is not satisfied
   |
   |
LL | fn ice() -> impl AsRef<Fn(&())> {
   |             ^^^^^^^^^^^^^^^^^^^ the trait `AsRef<(dyn for<'a> Fn(&'a ()) + 'static)>` is not implemented for `!`
error[E0782]: trait objects must include the `dyn` keyword
##[error]  --> /checkout/tests/ui/impl-trait/generic-with-implicit-hrtb-without-dyn.rs:6:24
   |
   |
LL | fn ice() -> impl AsRef<Fn(&())> {
   |
   |
help: add `dyn` keyword before this trait
   |
LL | fn ice() -> impl AsRef<dyn Fn(&())> {

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0277, E0782.
Some errors have detailed explanations: E0277, E0782.
For more information about an error, try `rustc --explain E0277`.
------------------------------------------


---- [ui] tests/ui/impl-trait/generic-with-implicit-hrtb-without-dyn.rs#edition2015 stdout ----
diff of stderr:

- error[E0277]: the trait bound `(): AsRef<(dyn for<'a> Fn(&'a ()) + 'static)>` is not satisfied
+ error[E0277]: the trait bound `!: AsRef<(dyn for<'a> Fn(&'a ()) + 'static)>` is not satisfied
3    |
3    |
4 LL | fn ice() -> impl AsRef<Fn(&())> {

-    |             ^^^^^^^^^^^^^^^^^^^ the trait `AsRef<(dyn for<'a> Fn(&'a ()) + 'static)>` is not implemented for `()`
+    |             ^^^^^^^^^^^^^^^^^^^ the trait `AsRef<(dyn for<'a> Fn(&'a ()) + 'static)>` is not implemented for `!`
7 error: aborting due to 1 previous error
8 



The actual stderr differed from the expected stderr.
Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/impl-trait/generic-with-implicit-hrtb-without-dyn.edition2015/generic-with-implicit-hrtb-without-dyn.edition2015.stderr
To update references, rerun the tests and pass the `--bless` flag
To only update this specific test, also pass `--test-args impl-trait/generic-with-implicit-hrtb-without-dyn.rs`

error in revision `edition2015`: 1 errors occurred comparing output.
status: exit status: 1
command: RUSTC_ICE="0" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/impl-trait/generic-with-implicit-hrtb-without-dyn.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "--cfg" "edition2015" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/impl-trait/generic-with-implicit-hrtb-without-dyn.edition2015" "-A" "unused" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/impl-trait/generic-with-implicit-hrtb-without-dyn.edition2015/auxiliary"
--- stderr -------------------------------
--- stderr -------------------------------
error[E0277]: the trait bound `!: AsRef<(dyn for<'a> Fn(&'a ()) + 'static)>` is not satisfied
   |
   |
LL | fn ice() -> impl AsRef<Fn(&())> {
   |             ^^^^^^^^^^^^^^^^^^^ the trait `AsRef<(dyn for<'a> Fn(&'a ()) + 'static)>` is not implemented for `!`
error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0277`.
------------------------------------------
---
- error[E0277]: `()` is not an iterator
+ error[E0277]: `!` is not an iterator
2   --> $DIR/issue-72911.rs:16:20
3    |
4 LL | fn lint_files() -> impl Iterator<Item = foo::MissingItem> {
-    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `()` is not an iterator
+    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `!` is not an iterator
6    |
-    = help: the trait `Iterator` is not implemented for `()`
---
To only update this specific test, also pass `--test-args impl-trait/issue-72911.rs`

error: 1 errors occurred comparing output.
status: exit status: 1
command: RUSTC_ICE="0" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/impl-trait/issue-72911.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/impl-trait/issue-72911" "-A" "unused" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/impl-trait/issue-72911/auxiliary"
--- stderr -------------------------------
error[E0277]: `!` is not an iterator
##[error]  --> /checkout/tests/ui/impl-trait/issue-72911.rs:16:20
   |
   |
LL | fn lint_files() -> impl Iterator<Item = foo::MissingItem> {
   |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `!` is not an iterator
   = help: the trait `Iterator` is not implemented for `!`

error[E0433]: failed to resolve: use of undeclared crate or module `foo`
##[error]  --> /checkout/tests/ui/impl-trait/issue-72911.rs:11:33
##[error]  --> /checkout/tests/ui/impl-trait/issue-72911.rs:11:33
   |
LL | fn gather_from_file(dir_entry: &foo::MissingItem) -> impl Iterator<Item = Lint> {

error[E0433]: failed to resolve: use of undeclared crate or module `foo`
##[error]  --> /checkout/tests/ui/impl-trait/issue-72911.rs:16:41
   |
   |
LL | fn lint_files() -> impl Iterator<Item = foo::MissingItem> {

error: aborting due to 3 previous errors

Some errors have detailed explanations: E0277, E0433.
---
diff of stderr:

11   --> $DIR/early_bound.rs:3:29
12    |
13 LL | fn test<'a: 'a>(n: bool) -> impl Sized + 'a {
-    |                             ^^^^^^^^^^^^^^^ expected `&()`, got `()`
+    |                             ^^^^^^^^^^^^^^^ expected `&()`, got `!`
16 note: previous use here
17   --> $DIR/early_bound.rs:7:36


---
--- stderr -------------------------------
error[E0792]: expected generic lifetime parameter, found `'_`
##[error]  --> /checkout/tests/ui/impl-trait/rpit/early_bound.rs:7:17
   |
LL | fn test<'a: 'a>(n: bool) -> impl Sized + 'a {
   |                                          -- this generic parameter must be used with a generic lifetime parameter
...
LL |         let _ = identity::<&'a ()>(test(false));

error: concrete type differs from previous defining opaque type use
##[error]  --> /checkout/tests/ui/impl-trait/rpit/early_bound.rs:3:29
   |
   |
LL | fn test<'a: 'a>(n: bool) -> impl Sized + 'a {
   |                             ^^^^^^^^^^^^^^^ expected `&()`, got `!`
note: previous use here
  --> /checkout/tests/ui/impl-trait/rpit/early_bound.rs:7:36
   |
   |
LL |         let _ = identity::<&'a ()>(test(false));

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0792`.
For more information about this error, try `rustc --explain E0792`.
------------------------------------------


---- [ui] tests/ui/never_type/diverging-fallback-control-flow.rs#fallback stdout ----

error in revision `fallback`: test compilation failed although it shouldn't!
status: exit status: 1
command: RUSTC_ICE="0" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/never_type/diverging-fallback-control-flow.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "--cfg" "fallback" "-O" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/diverging-fallback-control-flow.fallback/a" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/diverging-fallback-control-flow.fallback/auxiliary"
--- stderr -------------------------------
--- stderr -------------------------------
error[E0277]: the trait bound `!: UnitDefault` is not satisfied
   |
LL |         x = UnitDefault::default();
   |             ^^^^^^^^^^^^^^^^^^^^^^ the trait `UnitDefault` is not implemented for `!`
   |
   |
   = help: the following other types implement trait `UnitDefault`:
             ()
             u32
   = note: this error might have been caused by changes to Rust's type-inference algorithm (see issue #48950 <https://github.com/rust-lang/rust/issues/48950> for more information)
   = help: did you intend to use the type `()` here instead?

error[E0277]: the trait bound `!: UnitDefault` is not satisfied
   |
LL |         x = UnitDefault::default();
   |             ^^^^^^^^^^^^^^^^^^^^^^ the trait `UnitDefault` is not implemented for `!`
   |
   |
   = help: the following other types implement trait `UnitDefault`:
             ()
             u32
   = note: this error might have been caused by changes to Rust's type-inference algorithm (see issue #48950 <https://github.com/rust-lang/rust/issues/48950> for more information)
   = help: did you intend to use the type `()` here instead?
error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0277`.
------------------------------------------
------------------------------------------


---- [ui] tests/ui/never_type/diverging-fallback-unconstrained-return.rs#fallback stdout ----

error in revision `fallback`: test compilation failed although it shouldn't!
status: exit status: 1
command: RUSTC_ICE="0" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/never_type/diverging-fallback-unconstrained-return.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "--cfg" "fallback" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/diverging-fallback-unconstrained-return.fallback" "-A" "unused" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/diverging-fallback-unconstrained-return.fallback/auxiliary"
--- stderr -------------------------------
--- stderr -------------------------------
error[E0277]: the trait bound `!: UnitReturn` is not satisfied
   |
   |
LL |     let _ = if true { unconstrained_return() } else { panic!() };
   |                       ^^^^^^^^^^^^^^^^^^^^^^ the trait `UnitReturn` is not implemented for `!`
   = help: the following other types implement trait `UnitReturn`:
             ()
             i32
             i32
   = note: this error might have been caused by changes to Rust's type-inference algorithm (see issue #48950 <https://github.com/rust-lang/rust/issues/48950> for more information)
   = help: did you intend to use the type `()` here instead?
  --> /checkout/tests/ui/never_type/diverging-fallback-unconstrained-return.rs:20:28
   |
   |
LL | fn unconstrained_return<T: UnitReturn>() -> T {

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0277`.
For more information about this error, try `rustc --explain E0277`.
------------------------------------------


---- [ui] tests/ui/never_type/defaulted-never-note.rs#nofallback stdout ----

error in revision `nofallback`: test compilation failed although it shouldn't!
status: exit status: 1
command: RUSTC_ICE="0" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/never_type/defaulted-never-note.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "--cfg" "nofallback" "-O" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/defaulted-never-note.nofallback/a" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/defaulted-never-note.nofallback/auxiliary"
--- stderr -------------------------------
--- stderr -------------------------------
error[E0277]: the trait bound `!: ImplementedForUnitButNotNever` is not satisfied
   |
LL |     foo(_x);
LL |     foo(_x);
   |     --- ^^ the trait `ImplementedForUnitButNotNever` is not implemented for `!`
   |     required by a bound introduced by this call
   |
   |
   = help: the trait `ImplementedForUnitButNotNever` is implemented for `()`
   = note: this error might have been caused by changes to Rust's type-inference algorithm (see issue #48950 <https://github.com/rust-lang/rust/issues/48950> for more information)
   = help: did you intend to use the type `()` here instead?
note: required by a bound in `foo`
   |
   |
LL | fn foo<T: ImplementedForUnitButNotNever>(_t: T) {}
   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `foo`
error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0277`.
------------------------------------------
------------------------------------------


---- [ui] tests/ui/never_type/diverging-fallback-control-flow.rs#nofallback stdout ----

error in revision `nofallback`: test compilation failed although it shouldn't!
status: exit status: 1
command: RUSTC_ICE="0" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/never_type/diverging-fallback-control-flow.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "--cfg" "nofallback" "-O" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/diverging-fallback-control-flow.nofallback/a" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/diverging-fallback-control-flow.nofallback/auxiliary"
--- stderr -------------------------------
--- stderr -------------------------------
error[E0277]: the trait bound `!: UnitDefault` is not satisfied
   |
LL |         x = UnitDefault::default();
   |             ^^^^^^^^^^^^^^^^^^^^^^ the trait `UnitDefault` is not implemented for `!`
   |
   |
   = help: the following other types implement trait `UnitDefault`:
             ()
             u32
   = note: this error might have been caused by changes to Rust's type-inference algorithm (see issue #48950 <https://github.com/rust-lang/rust/issues/48950> for more information)
   = help: did you intend to use the type `()` here instead?

error[E0277]: the trait bound `!: UnitDefault` is not satisfied
   |
LL |         x = UnitDefault::default();
   |             ^^^^^^^^^^^^^^^^^^^^^^ the trait `UnitDefault` is not implemented for `!`
   |
   |
   = help: the following other types implement trait `UnitDefault`:
             ()
             u32
   = note: this error might have been caused by changes to Rust's type-inference algorithm (see issue #48950 <https://github.com/rust-lang/rust/issues/48950> for more information)
   = help: did you intend to use the type `()` here instead?
error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0277`.
------------------------------------------
------------------------------------------


---- [ui] tests/ui/never_type/diverging-fallback-unconstrained-return.rs#nofallback stdout ----

error in revision `nofallback`: test compilation failed although it shouldn't!
status: exit status: 1
command: RUSTC_ICE="0" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/never_type/diverging-fallback-unconstrained-return.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "--cfg" "nofallback" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/diverging-fallback-unconstrained-return.nofallback" "-A" "unused" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/diverging-fallback-unconstrained-return.nofallback/auxiliary"
--- stderr -------------------------------
--- stderr -------------------------------
error[E0277]: the trait bound `!: UnitReturn` is not satisfied
   |
   |
LL |     let _ = if true { unconstrained_return() } else { panic!() };
   |                       ^^^^^^^^^^^^^^^^^^^^^^ the trait `UnitReturn` is not implemented for `!`
   = help: the following other types implement trait `UnitReturn`:
             ()
             i32
             i32
   = note: this error might have been caused by changes to Rust's type-inference algorithm (see issue #48950 <https://github.com/rust-lang/rust/issues/48950> for more information)
   = help: did you intend to use the type `()` here instead?
  --> /checkout/tests/ui/never_type/diverging-fallback-unconstrained-return.rs:20:28
   |
   |
LL | fn unconstrained_return<T: UnitReturn>() -> T {

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0277`.
For more information about this error, try `rustc --explain E0277`.
------------------------------------------


---- [ui] tests/ui/never_type/diverging-fallback-no-leak.rs#nofallback stdout ----

error in revision `nofallback`: test compilation failed although it shouldn't!
status: exit status: 1
command: RUSTC_ICE="0" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/never_type/diverging-fallback-no-leak.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "--cfg" "nofallback" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/diverging-fallback-no-leak.nofallback" "-A" "unused" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/diverging-fallback-no-leak.nofallback/auxiliary"
--- stderr -------------------------------
--- stderr -------------------------------
error[E0277]: the trait bound `!: Test` is not satisfied
   |
LL |     unconstrained_arg(return);
   |     ----------------- ^^^^^^ the trait `Test` is not implemented for `!`
   |     |
   |     |
   |     required by a bound introduced by this call
   |
   = help: the following other types implement trait `Test`:
             ()
             i32
   = note: this error might have been caused by changes to Rust's type-inference algorithm (see issue #48950 <https://github.com/rust-lang/rust/issues/48950> for more information)
   = help: did you intend to use the type `()` here instead?
  --> /checkout/tests/ui/never_type/diverging-fallback-no-leak.rs:12:25
   |
   |
LL | fn unconstrained_arg<T: Test>(_: T) {}

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0277`.
For more information about this error, try `rustc --explain E0277`.
------------------------------------------


---- [ui] tests/ui/never_type/fallback-closure-ret.rs#nofallback stdout ----

error in revision `nofallback`: test compilation failed although it shouldn't!
status: exit status: 1
command: RUSTC_ICE="0" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/never_type/fallback-closure-ret.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "--cfg" "nofallback" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/fallback-closure-ret.nofallback" "-A" "unused" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/fallback-closure-ret.nofallback/auxiliary"
--- stderr -------------------------------
--- stderr -------------------------------
error[E0277]: the trait bound `!: Bar` is not satisfied
   |
   |
LL |     foo(|| panic!());
   |     ^^^^^^^^^^^^^^^^ the trait `Bar` is not implemented for `!`
   = help: the following other types implement trait `Bar`:
             ()
             u32
             u32
   = note: this error might have been caused by changes to Rust's type-inference algorithm (see issue #48950 <https://github.com/rust-lang/rust/issues/48950> for more information)
   = help: did you intend to use the type `()` here instead?
note: required by a bound in `foo`
   |
   |
LL | fn foo<R: Bar>(_: impl Fn() -> R) {}
   |           ^^^ required by this bound in `foo`
error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0277`.
------------------------------------------
------------------------------------------


---- [ui] tests/ui/never_type/fallback-closure-wrap.rs#nofallback stdout ----

error in revision `nofallback`: test compilation failed although it shouldn't!
status: exit status: 1
command: RUSTC_ICE="0" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/never_type/fallback-closure-wrap.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "--cfg" "nofallback" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/fallback-closure-wrap.nofallback" "-A" "unused" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/fallback-closure-wrap.nofallback/auxiliary"
--- stderr -------------------------------
--- stderr -------------------------------
error[E0271]: expected `{closure@fallback-closure-wrap.rs:18:40}` to be a closure that returns `()`, but it returns `!`
   |
LL |       let error = Closure::wrap(Box::new(move || {
   |  _______________________________^
   |  _______________________________^
LL | |         //[fallback]~^ to be a closure that returns `()`, but it returns `!`
LL | |         panic!("Can't connect to server.");
LL | |     }) as Box<dyn FnMut()>);
   | |______^ expected `()`, found `!`
   = note: expected unit type `()`
                   found type `!`
                   found type `!`
   = note: required for the cast from `Box<{closure@/checkout/tests/ui/never_type/fallback-closure-wrap.rs:18:40: 18:47}>` to `Box<dyn FnMut()>`
error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0271`.
------------------------------------------
------------------------------------------


---- [ui] tests/ui/never_type/fallback-closure-ret.rs#fallback stdout ----

error in revision `fallback`: test compilation failed although it shouldn't!
status: exit status: 1
command: RUSTC_ICE="0" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/never_type/fallback-closure-ret.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "--cfg" "fallback" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/fallback-closure-ret.fallback" "-A" "unused" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/fallback-closure-ret.fallback/auxiliary"
--- stderr -------------------------------
--- stderr -------------------------------
error[E0277]: the trait bound `!: Bar` is not satisfied
   |
   |
LL |     foo(|| panic!());
   |     ^^^^^^^^^^^^^^^^ the trait `Bar` is not implemented for `!`
   = help: the following other types implement trait `Bar`:
             ()
             u32
             u32
   = note: this error might have been caused by changes to Rust's type-inference algorithm (see issue #48950 <https://github.com/rust-lang/rust/issues/48950> for more information)
   = help: did you intend to use the type `()` here instead?
note: required by a bound in `foo`
   |
   |
LL | fn foo<R: Bar>(_: impl Fn() -> R) {}
   |           ^^^ required by this bound in `foo`
error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0277`.
------------------------------------------
------------------------------------------


---- [ui] tests/ui/never_type/feature-gate-never_type_fallback.rs stdout ----
diff of stderr:

- error[E0277]: the trait bound `(): T` is not satisfied
+ error[E0277]: the trait bound `!: T` is not satisfied
3    |
4 LL |     foo(panic!())

5    |     --- ^^^^^^^^
---
status: exit status: 1
command: RUSTC_ICE="0" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/never_type/feature-gate-never_type_fallback.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/feature-gate-never_type_fallback" "-A" "unused" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/feature-gate-never_type_fallback/auxiliary"
stdout: none
--- stderr -------------------------------
error[E0277]: the trait bound `!: T` is not satisfied
   |
   |
LL |     foo(panic!()) //~ ERROR
   |     |   |
   |     |   the trait `T` is not implemented for `!`
   |     |   this tail expression is of type `!`
   |     required by a bound introduced by this call
---
   | ^^^^^^^
note: required by a bound in `foo`
  --> /checkout/tests/ui/never_type/feature-gate-never_type_fallback.rs:13:16
   |
LL | fn foo(_: impl T) {}
   |                ^ required by this bound in `foo`
error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0277`.
------------------------------------------
---
status: exit status: 1
command: RUSTC_ICE="0" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/never_type/impl_trait_fallback.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/impl_trait_fallback" "-A" "unused" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/impl_trait_fallback/auxiliary"
stdout: none
--- stderr -------------------------------
error[E0277]: the trait bound `!: T` is not satisfied
   |
LL | fn should_ret_unit() -> impl T {
   |                         ^^^^^^ the trait `T` is not implemented for `!`
   |
   |
   = help: the trait `T` is implemented for `()`
   = note: this error might have been caused by changes to Rust's type-inference algorithm (see issue #48950 <https://github.com/rust-lang/rust/issues/48950> for more information)
   = help: did you intend to use the type `()` here instead?
error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0277`.
------------------------------------------
------------------------------------------


---- [ui] tests/ui/never_type/impl_trait_fallback2.rs stdout ----
diff of stderr:

- error[E0277]: the trait bound `(): T` is not satisfied
+ error[E0277]: the trait bound `!: T` is not satisfied
3    |
4 LL | fn should_ret_unit() -> impl T {

-    |                         ^^^^^^ the trait `T` is not implemented for `()`
-    |                         ^^^^^^ the trait `T` is not implemented for `()`
+    |                         ^^^^^^ the trait `T` is not implemented for `!`
6    |
7    = help: the trait `T` is implemented for `i32`
8 

- error[E0277]: the trait bound `(): T` is not satisfied
+ error[E0277]: the trait bound `!: T` is not satisfied
11    |
12 LL | fn a() -> Foo {

-    |           ^^^ the trait `T` is not implemented for `()`
---
status: exit status: 1
command: RUSTC_ICE="0" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/never_type/impl_trait_fallback2.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/impl_trait_fallback2" "-A" "unused" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/impl_trait_fallback2/auxiliary"
stdout: none
--- stderr -------------------------------
error[E0277]: the trait bound `!: T` is not satisfied
   |
LL | fn should_ret_unit() -> impl T {
   |                         ^^^^^^ the trait `T` is not implemented for `!`
   |
   |
   = help: the trait `T` is implemented for `i32`

error[E0277]: the trait bound `!: T` is not satisfied
   |
LL | fn a() -> Foo {
   |           ^^^ the trait `T` is not implemented for `!`
   |
---

---- [ui] tests/ui/never_type/impl_trait_fallback3.rs stdout ----
diff of stderr:

- error[E0277]: the trait bound `(): T` is not satisfied
+ error[E0277]: the trait bound `!: T` is not satisfied
3    |
4 LL | fn a() -> Foo {

-    |           ^^^ the trait `T` is not implemented for `()`
---
status: exit status: 1
command: RUSTC_ICE="0" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/never_type/impl_trait_fallback3.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/impl_trait_fallback3" "-A" "unused" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/impl_trait_fallback3/auxiliary"
stdout: none
--- stderr -------------------------------
error[E0277]: the trait bound `!: T` is not satisfied
   |
LL | fn a() -> Foo {
   |           ^^^ the trait `T` is not implemented for `!`
   |
---

---- [ui] tests/ui/never_type/impl_trait_fallback4.rs stdout ----
diff of stderr:

- error[E0277]: the trait bound `(): T` is not satisfied
+ error[E0277]: the trait bound `!: T` is not satisfied
3    |
4 LL | fn foo() -> impl T {

-    |             ^^^^^^ the trait `T` is not implemented for `()`
---
status: exit status: 1
command: RUSTC_ICE="0" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/never_type/impl_trait_fallback4.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/impl_trait_fallback4" "-A" "unused" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/impl_trait_fallback4/auxiliary"
stdout: none
--- stderr -------------------------------
error[E0277]: the trait bound `!: T` is not satisfied
   |
LL | fn foo() -> impl T {
   |             ^^^^^^ the trait `T` is not implemented for `!`
   |
---
- error[E0277]: cannot add `()` to `usize`
+ error[E0277]: cannot add `!` to `usize`
2   --> $DIR/issue-13352.rs:7:13
3    |
4 LL |     2_usize + (loop {});
-    |             ^ no implementation for `usize + ()`
+    |             ^ no implementation for `usize + !`
6    |
6    |
-    = help: the trait `Add<()>` is not implemented for `usize`
+    = help: the trait `Add<!>` is not implemented for `usize`
8    = help: the following other types implement trait `Add<Rhs>`:
9              <&'a usize as Add<usize>>
10              <&usize as Add<&usize>>

The actual stderr differed from the expected stderr.
Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/issue-13352/issue-13352.stderr
To update references, rerun the tests and pass the `--bless` flag
To update references, rerun the tests and pass the `--bless` flag
To only update this specific test, also pass `--test-args never_type/issue-13352.rs`

error: 1 errors occurred comparing output.
status: exit status: 1
command: RUSTC_ICE="0" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/never_type/issue-13352.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/issue-13352" "-A" "unused" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/issue-13352/auxiliary"
--- stderr -------------------------------
error[E0277]: cannot add `!` to `usize`
##[error]  --> /checkout/tests/ui/never_type/issue-13352.rs:7:13
   |
   |
LL |     2_usize + (loop {});
   |             ^ no implementation for `usize + !`
   |
   = help: the trait `Add<!>` is not implemented for `usize`
   = help: the following other types implement trait `Add<Rhs>`:
             <&'a usize as Add<usize>>
             <&usize as Add<&usize>>
             <usize as Add<&usize>>
             <usize as Add>
error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0277`.
------------------------------------------
------------------------------------------


---- [ui] tests/ui/never_type/never-value-fallback-issue-66757.rs#nofallback stdout ----

error in revision `nofallback`: ui test compiled successfully!
status: exit status: 0
command: RUSTC_ICE="0" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/never_type/never-value-fallback-issue-66757.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "--cfg" "nofallback" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/never-value-fallback-issue-66757.nofallback" "-A" "unused" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/never-value-fallback-issue-66757.nofallback/auxiliary"
stderr: none


---- [ui] tests/ui/never_type/issue-2149.rs stdout ----
---- [ui] tests/ui/never_type/issue-2149.rs stdout ----
diff of stderr:

- error[E0277]: cannot add `Vec<B>` to `()`
+ error[E0277]: cannot add `Vec<B>` to `!`
3    |
3    |
4 LL |         for elt in self { r = r + f(*elt); }

-    |                                 ^ no implementation for `() + Vec<B>`
+    |                                 ^ no implementation for `! + Vec<B>`
6    |
-    = help: the trait `Add<Vec<B>>` is not implemented for `()`
+    = help: the trait `Add<Vec<B>>` is not implemented for `!`
8 
9 error[E0599]: no method named `bind` found for array `[&str; 1]` in the current scope


The actual stderr differed from the expected stderr.
Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/issue-2149/issue-2149.stderr
Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/issue-2149/issue-2149.stderr
To update references, rerun the tests and pass the `--bless` flag
To only update this specific test, also pass `--test-args never_type/issue-2149.rs`

error: 1 errors occurred comparing output.
status: exit status: 1
command: RUSTC_ICE="0" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/never_type/issue-2149.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/issue-2149" "-A" "unused" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/never_type/issue-2149/auxiliary"
--- stderr -------------------------------
--- stderr -------------------------------
error[E0277]: cannot add `Vec<B>` to `!`
   |
   |
LL |         for elt in self { r = r + f(*elt); }
   |                                 ^ no implementation for `! + Vec<B>`
   |
   = help: the trait `Add<Vec<B>>` is not implemented for `!`

error[E0599]: no method named `bind` found for array `[&str; 1]` in the current scope
   |
   |
LL |     ["hi"].bind(|x| [x] );
   |            ^^^^ method not found in `[&str; 1]`
   = help: items from traits can only be used if the trait is implemented and in scope
   = help: items from traits can only be used if the trait is implemented and in scope
note: `VecMonad` defines an item `bind`, perhaps you need to implement it
   |
   |
LL | trait VecMonad<A> {

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0277, E0599.
---

13 LL | #![deny(unreachable_code)]
14    |         ^^^^^^^^^^^^^^^^
15 
- error[E0605]: non-primitive cast: `()` as `!`
-    |
-    |
- LL |     let x = {return} as !;
-    |             ^^^^^^^^^^^^^ an `as` expression can only be used to convert between primitive types or to coerce to a specific trait object
21 
- error: aborting due to 2 previous errors
- 
- For more information about this error, try `rustc --explain E0605`.
---
--- stderr -------------------------------
error: unreachable expression
##[error]  --> /checkout/tests/ui/reachable/expr_cast.rs:9:13
   |
LL |     let x = {return} as !; //~ ERROR unreachable
   |             ^------^^^^^^
   |             ||
   |             |any code following this expression is unreachable
   |             unreachable expression
note: the lint level is defined here
  --> /checkout/tests/ui/reachable/expr_cast.rs:4:9
   |
LL | #![deny(unreachable_code)]
---
- warning: 1 warning emitted
+ warning: unreachable pattern
+   --> $DIR/protect-precedences.rs:13:16
+    |
+ LL |         if let _ = return true && false {};
+    |
+    = note: `#[warn(unreachable_patterns)]` on by default
+ 
+ warning: 2 warnings emitted
---
status: exit status: 0
command: RUSTC_ICE="0" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/rfcs/rfc-2497-if-let-chains/protect-precedences.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "-O" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/rfcs/rfc-2497-if-let-chains/protect-precedences/a" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/rfcs/rfc-2497-if-let-chains/protect-precedences/auxiliary"
stdout: none
--- stderr -------------------------------
warning: unreachable block in `if` or `while` expression
   |
   |
LL |         if let _ = return true && false {};
   |                    -------------------- ^^ unreachable block in `if` or `while` expression
   |                    any code following this expression is unreachable
   |
   = note: `#[warn(unreachable_code)]` on by default


warning: unreachable pattern
##[warning]  --> /checkout/tests/ui/rfcs/rfc-2497-if-let-chains/protect-precedences.rs:13:16
   |
LL |         if let _ = return true && false {};
   |
   = note: `#[warn(unreachable_patterns)]` on by default

warning: 2 warnings emitted
---

2   --> $DIR/different_defining_uses_never_type.rs:12:13
3    |
4 LL | fn bar() -> Foo {
-    |             ^^^ expected `&'static str`, got `()`
+    |             ^^^ expected `&'static str`, got `!`
7 note: previous use here
8   --> $DIR/different_defining_uses_never_type.rs:9:5


---
--- stderr -------------------------------
error: concrete type differs from previous defining opaque type use
##[error]  --> /checkout/tests/ui/type-alias-impl-trait/different_defining_uses_never_type.rs:12:13
   |
LL | fn bar() -> Foo { //~ ERROR: concrete type differs from previous defining opaque type use
   |             ^^^ expected `&'static str`, got `!`
note: previous use here
  --> /checkout/tests/ui/type-alias-impl-trait/different_defining_uses_never_type.rs:9:5
   |
LL |     ""

WaffleLapkin · 2024-04-05T00:27:45Z

@bors try

bors · 2024-04-05T00:28:56Z

⌛ Trying commit 1868b33 with merge 2d84f27...

…self, r=<try> [experiment] Set never type fallback = `!` r? ghost cc `@traviscross`

bors · 2024-04-05T02:07:41Z

☀️ Try build successful - checks-actions
Build commit: 2d84f27 (2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2)

WaffleLapkin · 2024-04-05T17:01:33Z

@craterbot run start=master#385fa9d845dd326c6bbfd58c22244215e431948a end=try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 mode=check-only name=never-type-fallback-to-never list:https://crater-reports.s3.amazonaws.com/no-never-type-fallback/retry-regressed-list.txt

(using #122955's regressions as the crate list, since this can only break things that #122955 broke)

craterbot · 2024-04-05T17:01:36Z

🚨 Error: failed to parse the command

🆘 If you have any trouble with Crater please ping @rust-lang/infra!
ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

WaffleLapkin · 2024-04-05T17:03:35Z

@craterbot run start=master#385fa9d845dd326c6bbfd58c22244215e431948a end=try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 mode=check-only name=never-type-fallback-to-never crates=https://crater-reports.s3.amazonaws.com/no-never-type-fallback/retry-regressed-list.txt

(using #122955 regressions as the crate list, since this can only break things that #122955 broke)

craterbot · 2024-04-05T17:03:43Z

👌 Experiment never-type-fallback-to-never created and queued.
🔍 You can check out the queue and this experiment's details.

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

craterbot · 2024-04-05T17:03:57Z

🚧 Experiment never-type-fallback-to-never is now running

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

craterbot · 2024-04-05T23:14:35Z

🎉 Experiment never-type-fallback-to-never is completed!
📊 1822 regressed and 0 fixed (97965 total)
📰 Open the full report.

⚠️ If you notice any spurious failure please add them to the blacklist!
ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

…, r=compiler-errors Correctly change type when adding adjustments on top of `NeverToAny` I'm concerned that the check only caught the problem with `fallback = !`, because at least MIR contained `<() as PartialEq>::eq(move _5, move _7)` where `_5: ()`. I rediscovered the issue when looking at rust-lang#123482's crater run. r? compiler-errors Fixes rust-lang#120600

Rollup merge of rust-lang#123571 - WaffleLapkin:properly-adjust-never, r=compiler-errors Correctly change type when adding adjustments on top of `NeverToAny` I'm concerned that the check only caught the problem with `fallback = !`, because at least MIR contained `<() as PartialEq>::eq(move _5, move _7)` where `_5: ()`. I rediscovered the issue when looking at rust-lang#123482's crater run. r? compiler-errors Fixes rust-lang#120600

Set never type fallback = !

1868b33

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Apr 5, 2024

WaffleLapkin added the F-never_type `#![feature(never_type)]` label Apr 5, 2024

WaffleLapkin marked this pull request as draft April 5, 2024 00:28

bors added a commit to rust-lang-ci/rust that referenced this pull request Apr 5, 2024

Auto merge of rust-lang#123482 - WaffleLapkin:never-type-fallback-to-…

2d84f27

…self, r=<try> [experiment] Set never type fallback = `!` r? ghost cc `@traviscross`

craterbot added S-waiting-on-crater Status: Waiting on a crater run to be completed. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Apr 5, 2024

craterbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-crater Status: Waiting on a crater run to be completed. labels Apr 5, 2024

WaffleLapkin mentioned this pull request Apr 6, 2024

Correctly change type when adding adjustments on top of NeverToAny #123571

Merged

WaffleLapkin added S-experimental Status: Ongoing experiment that does not require reviewing and won't be merged in its current state. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Apr 24, 2024

traviscross mentioned this pull request May 30, 2024

Tracking Issue for Rust 2024: Make ! fall back to ! #123748

Closed

8 tasks

WaffleLapkin closed this Jul 7, 2024

traviscross mentioned this pull request Jul 23, 2024

Warning about Rust 2024 with the newest Nightly Compiler: this function depends on never type fallback being () redis-rs/redis-rs#1228

Closed

WaffleLapkin deleted the never-type-fallback-to-self branch June 1, 2025 13:27

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[experiment] Set never type fallback = `!`#123482

[experiment] Set never type fallback = `!`#123482
WaffleLapkin wants to merge 1 commit intorust-lang:masterfrom
WaffleLapkin:never-type-fallback-to-self

WaffleLapkin commented Apr 5, 2024 •

edited by traviscross

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WaffleLapkin commented Apr 5, 2024 • edited by traviscross Loading Uh oh! There was an error while loading. Please reload this page.

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WaffleLapkin commented Apr 5, 2024 •

edited by traviscross

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