ICE: compiler/rustc_middle/src/ty/generics.rs:188:18: expected type parameter, but found another generic parameter

[chengniansun]

Code

extern "platform-intrinsic" {
    fn simd_saturating_add<'a, T: 'a>(x: T, y: T);
}

Meta

rustc --version --verbose:

rustc 1.54.0-nightly (c1e8f3a58 2021-05-30)
binary: rustc
commit-hash: c1e8f3a5857c3c8d095fd212acc6ed442f4cc58b
commit-date: 2021-05-30
host: x86_64-unknown-linux-gnu
release: 1.54.0-nightly
LLVM version: 12.0.1

Error output

error[E0658]: platform intrinsics are experimental and possibly buggy
 --> mutant.rs:1:8
  |
1 | extern "platform-intrinsic" {
  |        ^^^^^^^^^^^^^^^^^^^^
  |
  = note: see issue #27731 <https://github.com/rust-lang/rust/issues/27731> for more information
  = help: add `#![feature(platform_intrinsics)]` to the crate attributes to enable

error[E0601]: `main` function not found in crate `mutant`
 --> mutant.rs:1:1
  |
1 | / extern "platform-intrinsic" {
2 | |     fn simd_saturating_add<'a, T: 'a>(x: T, y: T);
3 | | }
  | |_^ consider adding a `main` function to `mutant.rs`

error: internal compiler error: compiler/rustc_middle/src/ty/generics.rs:188:18: expected type parameter, but found another generic parameter

thread 'rustc' panicked at 'Box<Any>', compiler/rustc_errors/src/lib.rs:1005:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.54.0-nightly (c1e8f3a58 2021-05-30) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [check_mod_item_types] checking item types in top-level module
#1 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 3 previous errors

Some errors have detailed explanations: E0601, E0658.
For more information about an error, try `rustc --explain E0601`.

Backtrace

error[E0658]: platform intrinsics are experimental and possibly buggy
 --> mutant.rs:1:8
  |
1 | extern "platform-intrinsic" {
  |        ^^^^^^^^^^^^^^^^^^^^
  |
  = note: see issue #27731 <https://github.com/rust-lang/rust/issues/27731> for more information
  = help: add `#![feature(platform_intrinsics)]` to the crate attributes to enable

error[E0601]: `main` function not found in crate `mutant`
 --> mutant.rs:1:1
  |
1 | / extern "platform-intrinsic" {
2 | |     fn simd_saturating_add<'a, T: 'a>(x: T, y: T);
3 | | }
  | |_^ consider adding a `main` function to `mutant.rs`

error: internal compiler error: compiler/rustc_middle/src/ty/generics.rs:188:18: expected type parameter, but found another generic parameter

thread 'rustc' panicked at 'Box<Any>', compiler/rustc_errors/src/lib.rs:1005:9
stack backtrace:
   0: std::panicking::begin_panic
   1: std::panic::panic_any
   2: rustc_errors::HandlerInner::bug
   3: rustc_errors::Handler::bug
   4: rustc_middle::ty::context::tls::with_opt
   5: rustc_middle::util::bug::opt_span_bug_fmt
   6: rustc_middle::util::bug::bug_fmt
   7: rustc_middle::ty::generics::Generics::type_param
   8: rustc_middle::ty::error::<impl rustc_middle::ty::context::TyCtxt>::note_and_explain_type_err
   9: rustc_infer::infer::error_reporting::<impl rustc_infer::infer::InferCtxt>::note_type_err
  10: rustc_infer::infer::error_reporting::<impl rustc_infer::infer::InferCtxt>::report_and_explain_type_error
  11: rustc_infer::infer::InferCtxt::report_mismatched_types
  12: rustc_infer::infer::InferCtxtBuilder::enter
  13: rustc_typeck::check::intrinsic::equate_intrinsic_type
  14: rustc_typeck::check::intrinsic::check_platform_intrinsic_type
  15: rustc_typeck::check::check::check_item_type
  16: rustc_middle::hir::map::Map::visit_item_likes_in_module
  17: rustc_typeck::check::check::check_mod_item_types
  18: rustc_query_system::query::plumbing::get_query_impl
  19: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::check_mod_item_types
  20: rustc_session::utils::<impl rustc_session::session::Session>::time
  21: rustc_typeck::check_crate
  22: rustc_interface::passes::analysis
  23: rustc_query_system::query::plumbing::get_query_impl
  24: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::analysis
  25: rustc_interface::passes::QueryContext::enter
  26: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
  27: rustc_span::with_source_map
  28: scoped_tls::ScopedKey<T>::set
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.54.0-nightly (c1e8f3a58 2021-05-30) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [check_mod_item_types] checking item types in top-level module
#1 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 3 previous errors

Some errors have detailed explanations: E0601, E0658.
For more information about an error, try `rustc --explain E0601`.

[LingMan]

Regression in nightly-2019-11-07
found 6 bors merge commits in the specified range
commit[0] 2019-11-05UTC: Auto merge of 66121 - pietroalbini:rollup-8zrwe7l, r=pietroalbini
commit[1] 2019-11-06UTC: Auto merge of 66141 - Centril:rollup-n2fcvp9, r=Centril
commit[2] 2019-11-06UTC: Auto merge of 66143 - Centril:rollup-qmzuex0, r=Centril
commit[3] 2019-11-06UTC: Auto merge of 65830 - Quantumplation:master, r=davidtwco,estebank
commit[4] 2019-11-06UTC: Auto merge of 65134 - davidtwco:issue-19834-improper-ctypes-in-extern-C-fn, r=rkruppe
commit[5] 2019-11-06UTC: Auto merge of 65728 - ecstatic-morse:promotion-const-proj, r=eddyb
ERROR: no commits between 1423bec and 3804876 within last 167 days

CI artifacts have long been deleted, so I can't continue the bisect, but these are the candidate PRs.