rust-lang · rust-bors · Jan 15, 2026 · Jan 14, 2026
diff --git a/compiler/rustc_lint_defs/src/builtin.rs b/compiler/rustc_lint_defs/src/builtin.rs
@@ -4465,7 +4465,7 @@ declare_lint! {
     ///
     /// [future-incompatible]: ../index.md#future-incompatible-lints
     pub AMBIGUOUS_GLOB_IMPORTS,
-    Deny,
+    Warn,
     "detects certain glob imports that require reporting an ambiguity error",
     @future_incompatible = FutureIncompatibleInfo {
         reason: fcw!(FutureReleaseError #114095),

diff --git a/tests/ui/imports/ambiguous-10.rs b/tests/ui/imports/ambiguous-10.rs
@@ -1,5 +1,5 @@
 // https://github.com/rust-lang/rust/pull/113099#issuecomment-1637022296
-
+//@ check-pass
 mod a {
     pub enum Token {}
 }
@@ -13,6 +13,6 @@ mod b {
 use crate::a::*;
 use crate::b::*;
 fn c(_: Token) {}
-//~^ ERROR `Token` is ambiguous
+//~^ WARN `Token` is ambiguous
 //~| WARNING this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
 fn main() { }
diff --git a/tests/ui/imports/ambiguous-10.stderr b/tests/ui/imports/ambiguous-10.stderr
@@ -1,4 +1,4 @@
-error: `Token` is ambiguous
+warning: `Token` is ambiguous
   --> $DIR/ambiguous-10.rs:15:9
    |
 LL | fn c(_: Token) {}
@@ -19,12 +19,12 @@ note: `Token` could also refer to the enum imported here
 LL | use crate::b::*;
    |     ^^^^^^^^^^^
    = help: consider adding an explicit import of `Token` to disambiguate
-   = note: `#[deny(ambiguous_glob_imports)]` (part of `#[deny(future_incompatible)]`) on by default
+   = note: `#[warn(ambiguous_glob_imports)]` (part of `#[warn(future_incompatible)]`) on by default
 
-error: aborting due to 1 previous error
+warning: 1 warning emitted
 
 Future incompatibility report: Future breakage diagnostic:
-error: `Token` is ambiguous
+warning: `Token` is ambiguous
   --> $DIR/ambiguous-10.rs:15:9
    |
 LL | fn c(_: Token) {}
@@ -45,5 +45,5 @@ note: `Token` could also refer to the enum imported here
 LL | use crate::b::*;
    |     ^^^^^^^^^^^
    = help: consider adding an explicit import of `Token` to disambiguate
-   = note: `#[deny(ambiguous_glob_imports)]` (part of `#[deny(future_incompatible)]`) on by default
+   = note: `#[warn(ambiguous_glob_imports)]` (part of `#[warn(future_incompatible)]`) on by default
 
diff --git a/tests/ui/imports/ambiguous-12.rs b/tests/ui/imports/ambiguous-12.rs
@@ -1,5 +1,5 @@
 // https://github.com/rust-lang/rust/pull/113099#issuecomment-1637022296
-
+//@ check-pass
 macro_rules! m {
     () => {
         pub fn b() {}
@@ -19,6 +19,6 @@ use crate::public::*;
 
 fn main() {
     b();
-    //~^ ERROR `b` is ambiguous
+    //~^ WARN `b` is ambiguous
     //~| WARNING this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
 }
diff --git a/tests/ui/imports/ambiguous-12.stderr b/tests/ui/imports/ambiguous-12.stderr
@@ -1,4 +1,4 @@
-error: `b` is ambiguous
+warning: `b` is ambiguous
   --> $DIR/ambiguous-12.rs:21:5
    |
 LL |     b();
@@ -19,12 +19,12 @@ note: `b` could also refer to the function imported here
 LL | use crate::public::*;
    |     ^^^^^^^^^^^^^^^^
    = help: consider adding an explicit import of `b` to disambiguate
-   = note: `#[deny(ambiguous_glob_imports)]` (part of `#[deny(future_incompatible)]`) on by default
+   = note: `#[warn(ambiguous_glob_imports)]` (part of `#[warn(future_incompatible)]`) on by default
 
-error: aborting due to 1 previous error
+warning: 1 warning emitted
 
 Future incompatibility report: Future breakage diagnostic:
-error: `b` is ambiguous
+warning: `b` is ambiguous
   --> $DIR/ambiguous-12.rs:21:5
    |
 LL |     b();
@@ -45,5 +45,5 @@ note: `b` could also refer to the function imported here
 LL | use crate::public::*;
    |     ^^^^^^^^^^^^^^^^
    = help: consider adding an explicit import of `b` to disambiguate
-   = note: `#[deny(ambiguous_glob_imports)]` (part of `#[deny(future_incompatible)]`) on by default
+   = note: `#[warn(ambiguous_glob_imports)]` (part of `#[warn(future_incompatible)]`) on by default
 
diff --git a/tests/ui/imports/ambiguous-13.rs b/tests/ui/imports/ambiguous-13.rs
@@ -1,5 +1,5 @@
 // https://github.com/rust-lang/rust/pull/113099#issuecomment-1637022296
-
+//@ check-pass
 pub mod object {
     #[derive(Debug)]
     pub struct Rect;
@@ -16,6 +16,6 @@ use crate::object::*;
 use crate::content::*;
 
 fn a(_: Rect) {}
-//~^ ERROR `Rect` is ambiguous
+//~^ WARN `Rect` is ambiguous
 //~| WARNING this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
 fn main() { }
diff --git a/tests/ui/imports/ambiguous-13.stderr b/tests/ui/imports/ambiguous-13.stderr
@@ -1,4 +1,4 @@
-error: `Rect` is ambiguous
+warning: `Rect` is ambiguous
   --> $DIR/ambiguous-13.rs:18:9
    |
 LL | fn a(_: Rect) {}
@@ -19,12 +19,12 @@ note: `Rect` could also refer to the struct imported here
 LL | use crate::content::*;
    |     ^^^^^^^^^^^^^^^^^
    = help: consider adding an explicit import of `Rect` to disambiguate
-   = note: `#[deny(ambiguous_glob_imports)]` (part of `#[deny(future_incompatible)]`) on by default
+   = note: `#[warn(ambiguous_glob_imports)]` (part of `#[warn(future_incompatible)]`) on by default
 
-error: aborting due to 1 previous error
+warning: 1 warning emitted
 
 Future incompatibility report: Future breakage diagnostic:
-error: `Rect` is ambiguous
+warning: `Rect` is ambiguous
   --> $DIR/ambiguous-13.rs:18:9
    |
 LL | fn a(_: Rect) {}
@@ -45,5 +45,5 @@ note: `Rect` could also refer to the struct imported here
 LL | use crate::content::*;
    |     ^^^^^^^^^^^^^^^^^
    = help: consider adding an explicit import of `Rect` to disambiguate
-   = note: `#[deny(ambiguous_glob_imports)]` (part of `#[deny(future_incompatible)]`) on by default
+   = note: `#[warn(ambiguous_glob_imports)]` (part of `#[warn(future_incompatible)]`) on by default
 
diff --git a/tests/ui/imports/ambiguous-14.rs b/tests/ui/imports/ambiguous-14.rs
@@ -1,6 +1,6 @@
 //@ edition:2015
 // https://github.com/rust-lang/rust/issues/98467
-
+//@ check-pass
 mod a {
     pub fn foo() {}
 }
@@ -21,6 +21,6 @@ mod g {
 
 fn main() {
     g::foo();
-    //~^ ERROR `foo` is ambiguous
+    //~^ WARN `foo` is ambiguous
     //~| WARNING this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
 }
diff --git a/tests/ui/imports/ambiguous-14.stderr b/tests/ui/imports/ambiguous-14.stderr
@@ -1,4 +1,4 @@
-error: `foo` is ambiguous
+warning: `foo` is ambiguous
   --> $DIR/ambiguous-14.rs:23:8
    |
 LL |     g::foo();
@@ -19,12 +19,12 @@ note: `foo` could also refer to the function imported here
 LL |     pub use f::*;
    |             ^^^^
    = help: consider adding an explicit import of `foo` to disambiguate
-   = note: `#[deny(ambiguous_glob_imports)]` (part of `#[deny(future_incompatible)]`) on by default
+   = note: `#[warn(ambiguous_glob_imports)]` (part of `#[warn(future_incompatible)]`) on by default
 
-error: aborting due to 1 previous error
+warning: 1 warning emitted
 
 Future incompatibility report: Future breakage diagnostic:
-error: `foo` is ambiguous
+warning: `foo` is ambiguous
   --> $DIR/ambiguous-14.rs:23:8
    |
 LL |     g::foo();
@@ -45,5 +45,5 @@ note: `foo` could also refer to the function imported here
 LL |     pub use f::*;
    |             ^^^^
    = help: consider adding an explicit import of `foo` to disambiguate
-   = note: `#[deny(ambiguous_glob_imports)]` (part of `#[deny(future_incompatible)]`) on by default
+   = note: `#[warn(ambiguous_glob_imports)]` (part of `#[warn(future_incompatible)]`) on by default
 
diff --git a/tests/ui/imports/ambiguous-15.rs b/tests/ui/imports/ambiguous-15.rs
@@ -1,5 +1,5 @@
 // https://github.com/rust-lang/rust/pull/113099#issuecomment-1638206152
-
+//@ check-pass
 mod t2 {
     #[derive(Debug)]
     pub enum Error {}
@@ -20,7 +20,7 @@ mod t3 {
 
 use self::t3::*;
 fn a<E: Error>(_: E) {}
-//~^ ERROR `Error` is ambiguous
+//~^ WARN `Error` is ambiguous
 //~| WARNING this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
 
 fn main() {}
diff --git a/tests/ui/imports/ambiguous-15.stderr b/tests/ui/imports/ambiguous-15.stderr
@@ -1,4 +1,4 @@
-error: `Error` is ambiguous
+warning: `Error` is ambiguous
   --> $DIR/ambiguous-15.rs:22:9
    |
 LL | fn a<E: Error>(_: E) {}
@@ -19,12 +19,12 @@ note: `Error` could also refer to the enum imported here
 LL | pub use t2::*;
    |         ^^^^^
    = help: consider adding an explicit import of `Error` to disambiguate
-   = note: `#[deny(ambiguous_glob_imports)]` (part of `#[deny(future_incompatible)]`) on by default
+   = note: `#[warn(ambiguous_glob_imports)]` (part of `#[warn(future_incompatible)]`) on by default
 
-error: aborting due to 1 previous error
+warning: 1 warning emitted
 
 Future incompatibility report: Future breakage diagnostic:
-error: `Error` is ambiguous
+warning: `Error` is ambiguous
   --> $DIR/ambiguous-15.rs:22:9
    |
 LL | fn a<E: Error>(_: E) {}
@@ -45,5 +45,5 @@ note: `Error` could also refer to the enum imported here
 LL | pub use t2::*;
    |         ^^^^^
    = help: consider adding an explicit import of `Error` to disambiguate
-   = note: `#[deny(ambiguous_glob_imports)]` (part of `#[deny(future_incompatible)]`) on by default
+   = note: `#[warn(ambiguous_glob_imports)]` (part of `#[warn(future_incompatible)]`) on by default
 
diff --git a/tests/ui/imports/ambiguous-16.rs b/tests/ui/imports/ambiguous-16.rs
@@ -1,5 +1,5 @@
 // https://github.com/rust-lang/rust/pull/113099
-
+//@ check-pass
 mod framing {
     mod public_message {
         use super::*;
@@ -20,7 +20,7 @@ mod framing {
 }
 
 use crate::framing::ConfirmedTranscriptHashInput;
-//~^ ERROR `ConfirmedTranscriptHashInput` is ambiguous
+//~^ WARN `ConfirmedTranscriptHashInput` is ambiguous
 //~| WARNING this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
 
 fn main() { }
diff --git a/tests/ui/imports/ambiguous-16.stderr b/tests/ui/imports/ambiguous-16.stderr
@@ -1,4 +1,4 @@
-error: `ConfirmedTranscriptHashInput` is ambiguous
+warning: `ConfirmedTranscriptHashInput` is ambiguous
   --> $DIR/ambiguous-16.rs:22:21
    |
 LL | use crate::framing::ConfirmedTranscriptHashInput;
@@ -19,12 +19,12 @@ note: `ConfirmedTranscriptHashInput` could also refer to the struct imported her
 LL |     pub use self::public_message_in::*;
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^
    = help: consider adding an explicit import of `ConfirmedTranscriptHashInput` to disambiguate
-   = note: `#[deny(ambiguous_glob_imports)]` (part of `#[deny(future_incompatible)]`) on by default
+   = note: `#[warn(ambiguous_glob_imports)]` (part of `#[warn(future_incompatible)]`) on by default
 
-error: aborting due to 1 previous error
+warning: 1 warning emitted
 
 Future incompatibility report: Future breakage diagnostic:
-error: `ConfirmedTranscriptHashInput` is ambiguous
+warning: `ConfirmedTranscriptHashInput` is ambiguous
   --> $DIR/ambiguous-16.rs:22:21
    |
 LL | use crate::framing::ConfirmedTranscriptHashInput;
@@ -45,5 +45,5 @@ note: `ConfirmedTranscriptHashInput` could also refer to the struct imported her
 LL |     pub use self::public_message_in::*;
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^
    = help: consider adding an explicit import of `ConfirmedTranscriptHashInput` to disambiguate
-   = note: `#[deny(ambiguous_glob_imports)]` (part of `#[deny(future_incompatible)]`) on by default
+   = note: `#[warn(ambiguous_glob_imports)]` (part of `#[warn(future_incompatible)]`) on by default
 
diff --git a/tests/ui/imports/ambiguous-17.rs b/tests/ui/imports/ambiguous-17.rs
@@ -1,6 +1,6 @@
 //@ edition:2015
 // https://github.com/rust-lang/rust/pull/113099#issuecomment-1638206152
-
+//@ check-pass
 pub use evp::*; //~ WARNING ambiguous glob re-exports
 pub use handwritten::*;
 
@@ -24,6 +24,6 @@ mod handwritten {
 
 fn main() {
     id();
-    //~^ ERROR `id` is ambiguous
+    //~^ WARN `id` is ambiguous
     //~| WARNING this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
 }
diff --git a/tests/ui/imports/ambiguous-17.stderr b/tests/ui/imports/ambiguous-17.stderr
@@ -8,7 +8,7 @@ LL | pub use handwritten::*;
    |
    = note: `#[warn(ambiguous_glob_reexports)]` on by default
 
-error: `id` is ambiguous
+warning: `id` is ambiguous
   --> $DIR/ambiguous-17.rs:26:5
    |
 LL |     id();
@@ -29,12 +29,12 @@ note: `id` could also refer to the function imported here
 LL | pub use handwritten::*;
    |         ^^^^^^^^^^^^^^
    = help: consider adding an explicit import of `id` to disambiguate
-   = note: `#[deny(ambiguous_glob_imports)]` (part of `#[deny(future_incompatible)]`) on by default
+   = note: `#[warn(ambiguous_glob_imports)]` (part of `#[warn(future_incompatible)]`) on by default
 
-error: aborting due to 1 previous error; 1 warning emitted
+warning: 2 warnings emitted
 
 Future incompatibility report: Future breakage diagnostic:
-error: `id` is ambiguous
+warning: `id` is ambiguous
   --> $DIR/ambiguous-17.rs:26:5
    |
 LL |     id();
@@ -55,5 +55,5 @@ note: `id` could also refer to the function imported here
 LL | pub use handwritten::*;
    |         ^^^^^^^^^^^^^^
    = help: consider adding an explicit import of `id` to disambiguate
-   = note: `#[deny(ambiguous_glob_imports)]` (part of `#[deny(future_incompatible)]`) on by default
+   = note: `#[warn(ambiguous_glob_imports)]` (part of `#[warn(future_incompatible)]`) on by default
 
diff --git a/tests/ui/imports/ambiguous-2.rs b/tests/ui/imports/ambiguous-2.rs
@@ -1,9 +1,9 @@
 //@ aux-build: ../ambiguous-1.rs
 // https://github.com/rust-lang/rust/pull/113099#issuecomment-1633574396
-
+//@ check-pass
 extern crate ambiguous_1;
 
 fn main() {
-    ambiguous_1::id(); //~ ERROR `id` is ambiguous
+    ambiguous_1::id(); //~ WARN `id` is ambiguous
                        //~| WARN this was previously accepted
 }
diff --git a/tests/ui/imports/ambiguous-2.stderr b/tests/ui/imports/ambiguous-2.stderr
@@ -1,4 +1,4 @@
-error: `id` is ambiguous
+warning: `id` is ambiguous
   --> $DIR/ambiguous-2.rs:7:18
    |
 LL |     ambiguous_1::id();
@@ -17,12 +17,12 @@ note: `id` could also refer to the function defined here
    |
 LL |     pub use self::handwritten::*;
    |             ^^^^^^^^^^^^^^^^^
-   = note: `#[deny(ambiguous_glob_imports)]` (part of `#[deny(future_incompatible)]`) on by default
+   = note: `#[warn(ambiguous_glob_imports)]` (part of `#[warn(future_incompatible)]`) on by default
 
-error: aborting due to 1 previous error
+warning: 1 warning emitted
 
 Future incompatibility report: Future breakage diagnostic:
-error: `id` is ambiguous
+warning: `id` is ambiguous
   --> $DIR/ambiguous-2.rs:7:18
    |
 LL |     ambiguous_1::id();
@@ -41,5 +41,5 @@ note: `id` could also refer to the function defined here
    |
 LL |     pub use self::handwritten::*;
    |             ^^^^^^^^^^^^^^^^^
-   = note: `#[deny(ambiguous_glob_imports)]` (part of `#[deny(future_incompatible)]`) on by default
+   = note: `#[warn(ambiguous_glob_imports)]` (part of `#[warn(future_incompatible)]`) on by default
 
diff --git a/tests/ui/imports/ambiguous-3.rs b/tests/ui/imports/ambiguous-3.rs
@@ -1,9 +1,9 @@
 // https://github.com/rust-lang/rust/issues/47525
-
+//@ check-pass
 fn main() {
     use a::*;
     x();
-    //~^ ERROR `x` is ambiguous
+    //~^ WARN `x` is ambiguous
     //~| WARNING this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
 }