deps: bump rustc-ap to v691

[calebcartwright]

We have another broken toolstate issue with RLS and rustfmt that requires bumping the rustc-ap crates to the latest version.

I am getting one test failure in my local environment even after these changes, but I was getting five test failures with the latest on master so I'm guessing this is unrelated

Refs rust-lang/rust#79406 and rust-lang/rust#79407

r? @kngwyu and/or @Xanewok

[kngwyu]

Thanks, I'll fix these tests later.

[Xanewok]

Should we block releasing 2.1.41 on fixed tests?

[kngwyu]

@Xanewok
This failure is because the stdlib location changed and can be critical.
I'll do my best but please wait for 1~2 days (now my work time for OSS is limited, sorry).

[Xanewok]

I am getting one test failure in my local environment even after these changes, but I was getting five test failures with the latest on master so I'm guessing this is unrelated

@calebcartwright this was probably caused by not having rust-src component - that's what I'm seeing locally after introducing the rust-toolchain file. One fix would be to use the new format (introduced in Rustup 1.23), i.e.:

# rust-toolchain
[toolchain]
channel = "nightly-2020-11-27"
components = ["rust-src"]

After installing this locally, now only completes_for_alias_with_resolved_generics, which is the same error that is failing in the CI.

[Xanewok]

Running the test with RUST_LOG=trace (and calling env_logger::try_init()) yields a following log:

[2020-11-30T19:47:32Z DEBUG racer::ast] destructure_pattern_to_ty point BytePos(4) ty Match(Match ["Vec", "/home/xanewok/.rustup/toolchains/nightly-2020-11-27-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/alloc/src/vec.rs", BytePos(10934), true, Struct(GenericsArgs([])), |pub struct Vec<T, #[unstable(feature = " ", issue = " ")] A: AllocRef = Global>|]) pat: Ident(ByValue(Not), v#0, None)

There's a good chance that rust-lang/rust#78461 broke the test - it seems that inline attribute on a generic parameter is not recognized, i.e. Struct(GenericsArgs([])). I'll dig deeper.

[Xanewok]

FYI I published a 2.1.41 version that includes this dep bump.

cc @kngwyu

[kngwyu]

Thanks!