ICE: ./src/test/ui/inference/infer-arg-test.rs: not yet impemented with -Zsave-analysis

[matthiaskrgr]

Code

./src/test/ui/inference/infer-arg-test.rs

#![feature(generic_arg_infer)]

struct All<'a, T, const N: usize> {
  v: &'a T,
}

struct BadInfer<_>;
//~^ ERROR expected identifier
//~| ERROR parameter `_` is never used

fn all_fn<'a, T, const N: usize>() {}

fn bad_infer_fn<_>() {}
//~^ ERROR expected identifier


fn main() {
  let a: All<_, _, _>;
  all_fn();
  let v: [u8; _];
  //~^ ERROR in expressions
  let v: [u8; 10] = [0; _];
  //~^ ERROR in expressions
}

Meta

rustc --version --verbose:

rustc 1.57.0-nightly (6c33a0a2e 2021-09-18)
binary: rustc
commit-hash: 6c33a0a2ec8a32016fcb35342ae9d08087e38d5c
commit-date: 2021-09-18
host: x86_64-unknown-linux-gnu
release: 1.57.0-nightly
LLVM version: 13.0.0

Error output

error: expected identifier, found reserved identifier `_`
 --> ./src/test/ui/inference/infer-arg-test.rs:7:17
  |
7 | struct BadInfer<_>;
  |                 ^ expected identifier, found reserved identifier

error: expected identifier, found reserved identifier `_`
  --> ./src/test/ui/inference/infer-arg-test.rs:13:17
   |
13 | fn bad_infer_fn<_>() {}
   |                 ^ expected identifier, found reserved identifier

error: in expressions, `_` can only be used on the left-hand side of an assignment
  --> ./src/test/ui/inference/infer-arg-test.rs:20:15
   |
20 |   let v: [u8; _];
   |               ^ `_` not allowed here

error: in expressions, `_` can only be used on the left-hand side of an assignment
  --> ./src/test/ui/inference/infer-arg-test.rs:22:25
   |
22 |   let v: [u8; 10] = [0; _];
   |                         ^ `_` not allowed here

error[E0392]: parameter `_` is never used
 --> ./src/test/ui/inference/infer-arg-test.rs:7:17
  |
7 | struct BadInfer<_>;
  |                 ^ unused parameter
  |
  = help: consider removing `_`, referring to it in a field, or using a marker such as `PhantomData`
  = help: if you intended `_` to be a const parameter, use `const _: usize` instead

error[E0107]: this struct takes 2 generic arguments but 3 generic arguments were supplied
  --> ./src/test/ui/inference/infer-arg-test.rs:18:10
   |
18 |   let a: All<_, _, _>;
   |          ^^^       - help: remove this generic argument
   |          |
   |          expected 2 generic arguments
   |
note: struct defined here, with 2 generic parameters: `T`, `N`
  --> ./src/test/ui/inference/infer-arg-test.rs:3:8
   |
3  | struct All<'a, T, const N: usize> {
   |        ^^^     -        -

thread 'rustc' panicked at 'not yet implemented', compiler/rustc_typeck/src/astconv/mod.rs:462:29
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

error: internal compiler error: unexpected panic

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 1.57.0-nightly (6c33a0a2e 2021-09-18) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z save-analysis

query stack during panic:
#0 [typeck] type-checking `main`
end of query stack
error: aborting due to 6 previous errors

Some errors have detailed explanations: E0107, E0392.
For more information about an error, try `rustc --explain E0107`.

Backtrace

error: expected identifier, found reserved identifier `_`
 --> ./src/test/ui/inference/infer-arg-test.rs:7:17
  |
7 | struct BadInfer<_>;
  |                 ^ expected identifier, found reserved identifier

error: expected identifier, found reserved identifier `_`
  --> ./src/test/ui/inference/infer-arg-test.rs:13:17
   |
13 | fn bad_infer_fn<_>() {}
   |                 ^ expected identifier, found reserved identifier

error: in expressions, `_` can only be used on the left-hand side of an assignment
  --> ./src/test/ui/inference/infer-arg-test.rs:20:15
   |
20 |   let v: [u8; _];
   |               ^ `_` not allowed here

error: in expressions, `_` can only be used on the left-hand side of an assignment
  --> ./src/test/ui/inference/infer-arg-test.rs:22:25
   |
22 |   let v: [u8; 10] = [0; _];
   |                         ^ `_` not allowed here

error[E0392]: parameter `_` is never used
 --> ./src/test/ui/inference/infer-arg-test.rs:7:17
  |
7 | struct BadInfer<_>;
  |                 ^ unused parameter
  |
  = help: consider removing `_`, referring to it in a field, or using a marker such as `PhantomData`
  = help: if you intended `_` to be a const parameter, use `const _: usize` instead

error[E0107]: this struct takes 2 generic arguments but 3 generic arguments were supplied
  --> ./src/test/ui/inference/infer-arg-test.rs:18:10
   |
18 |   let a: All<_, _, _>;
   |          ^^^       - help: remove this generic argument
   |          |
   |          expected 2 generic arguments
   |
note: struct defined here, with 2 generic parameters: `T`, `N`
  --> ./src/test/ui/inference/infer-arg-test.rs:3:8
   |
3  | struct All<'a, T, const N: usize> {
   |        ^^^     -        -

thread 'rustc' panicked at 'not yet implemented', compiler/rustc_typeck/src/astconv/mod.rs:462:29
stack backtrace:
   0:     0x7f4f60a6251c - std::backtrace_rs::backtrace::libunwind::trace::h2ab374bc2a3b7023
                               at /rustc/6c33a0a2ec8a32016fcb35342ae9d08087e38d5c/library/std/src/../../backtrace/src/backtrace/libunwind.rs:90:5
   1:     0x7f4f60a6251c - std::backtrace_rs::backtrace::trace_unsynchronized::h128cb5178b04dc46
                               at /rustc/6c33a0a2ec8a32016fcb35342ae9d08087e38d5c/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f4f60a6251c - std::sys_common::backtrace::_print_fmt::h5344f9eefca2041f
                               at /rustc/6c33a0a2ec8a32016fcb35342ae9d08087e38d5c/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x7f4f60a6251c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h213003bc5c7acf04
                               at /rustc/6c33a0a2ec8a32016fcb35342ae9d08087e38d5c/library/std/src/sys_common/backtrace.rs:46:22
   4:     0x7f4f60ac07dc - core::fmt::write::h78bf85fc3e93663f
                               at /rustc/6c33a0a2ec8a32016fcb35342ae9d08087e38d5c/library/core/src/fmt/mod.rs:1126:17
   5:     0x7f4f60a53405 - std::io::Write::write_fmt::he619515c888f21a5
                               at /rustc/6c33a0a2ec8a32016fcb35342ae9d08087e38d5c/library/std/src/io/mod.rs:1667:15
   6:     0x7f4f60a65a80 - std::sys_common::backtrace::_print::hf706674f77848203
                               at /rustc/6c33a0a2ec8a32016fcb35342ae9d08087e38d5c/library/std/src/sys_common/backtrace.rs:49:5
   7:     0x7f4f60a65a80 - std::sys_common::backtrace::print::hf0b6c7a88804ec56
                               at /rustc/6c33a0a2ec8a32016fcb35342ae9d08087e38d5c/library/std/src/sys_common/backtrace.rs:36:9
   8:     0x7f4f60a65a80 - std::panicking::default_hook::{{closure}}::h2dde766cd83a333a
                               at /rustc/6c33a0a2ec8a32016fcb35342ae9d08087e38d5c/library/std/src/panicking.rs:210:50
   9:     0x7f4f60a65637 - std::panicking::default_hook::h501e3b2e134eb149
                               at /rustc/6c33a0a2ec8a32016fcb35342ae9d08087e38d5c/library/std/src/panicking.rs:227:9
  10:     0x7f4f61245f51 - rustc_driver::DEFAULT_HOOK::{{closure}}::{{closure}}::he756f1e8c1181d3b
  11:     0x7f4f60a66299 - std::panicking::rust_panic_with_hook::hc09e869c4cf00885
                               at /rustc/6c33a0a2ec8a32016fcb35342ae9d08087e38d5c/library/std/src/panicking.rs:628:17
  12:     0x7f4f60a65d22 - std::panicking::begin_panic_handler::{{closure}}::hc2c6d70142458fc8
                               at /rustc/6c33a0a2ec8a32016fcb35342ae9d08087e38d5c/library/std/src/panicking.rs:519:13
  13:     0x7f4f60a629c4 - std::sys_common::backtrace::__rust_end_short_backtrace::had58f7c459a1cd6e
                               at /rustc/6c33a0a2ec8a32016fcb35342ae9d08087e38d5c/library/std/src/sys_common/backtrace.rs:141:18
  14:     0x7f4f60a65cb9 - rust_begin_unwind
                               at /rustc/6c33a0a2ec8a32016fcb35342ae9d08087e38d5c/library/std/src/panicking.rs:517:5
  15:     0x7f4f60a2b861 - core::panicking::panic_fmt::hf443e5eeb6cc9eab
                               at /rustc/6c33a0a2ec8a32016fcb35342ae9d08087e38d5c/library/core/src/panicking.rs:103:14
  16:     0x7f4f60a2b7ad - core::panicking::panic::h50b51d19800453c0
                               at /rustc/6c33a0a2ec8a32016fcb35342ae9d08087e38d5c/library/core/src/panicking.rs:50:5
  17:     0x7f4f625f0360 - <<dyn rustc_typeck::astconv::AstConv>::create_substs_for_ast_path::SubstsForAstPathCtxt as rustc_typeck::astconv::CreateSubstsForGenericArgsCtxt>::provided_kind::hd27533ba044dfdb1
  18:     0x7f4f625ed8a1 - <dyn rustc_typeck::astconv::AstConv>::create_substs_for_ast_path::hdc70fffec5683393
  19:     0x7f4f625e7a24 - <dyn rustc_typeck::astconv::AstConv>::ast_path_substs_for_ty::h475721814acfe140
  20:     0x7f4f625e8387 - <dyn rustc_typeck::astconv::AstConv>::ast_path_to_ty::h7d884b8259ee57d2
  21:     0x7f4f625f0889 - <dyn rustc_typeck::astconv::AstConv>::ast_ty_to_ty_inner::h3bd2d155d3a92192
  22:     0x7f4f62620e9a - <rustc_typeck::check::gather_locals::GatherLocalsVisitor as rustc_hir::intravisit::Visitor>::visit_local::h49b7cf8e3b7265c2
  23:     0x7f4f62597e76 - rustc_hir::intravisit::walk_expr::h2aa3efa9f6724d3f
  24:     0x7f4f62648153 - rustc_typeck::check::check::check_fn::h22859037fe91ae06
  25:     0x7f4f625ff58d - rustc_infer::infer::InferCtxtBuilder::enter::h6497f632ea603058
  26:     0x7f4f625a66ba - rustc_typeck::check::typeck::h30e85507fb0c045e
  27:     0x7f4f6298589f - rustc_query_system::query::plumbing::try_execute_query::h962ee77e1a4e17d7
  28:     0x7f4f62a0078c - <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::typeck::h2edc91f1d8d9a428
  29:     0x7f4f61296fd3 - rustc_save_analysis::dump_visitor::DumpVisitor::nest_typeck_results::hc61e603166c7031b
  30:     0x7f4f6129dfa2 - <rustc_save_analysis::dump_visitor::DumpVisitor as rustc_hir::intravisit::Visitor>::visit_item::h3c1542be36f664dd
  31:     0x7f4f61295fb6 - rustc_hir::intravisit::Visitor::visit_nested_item::hed32e44f3e7a9e0d
  32:     0x7f4f612845e7 - rustc_hir::intravisit::walk_mod::hda2665ecb6d5bb12
  33:     0x7f4f612925a3 - rustc_middle::hir::map::Map::walk_toplevel_module::h5e3c39f11bf1c883
  34:     0x7f4f6129b965 - rustc_save_analysis::dump_visitor::DumpVisitor::process_crate::he52095d5868ac37c
  35:     0x7f4f61276262 - rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps::h5135873aa9381dc0
  36:     0x7f4f61278257 - std::thread::local::LocalKey<T>::with::hedc911502788cc56
  37:     0x7f4f6124b287 - rustc_save_analysis::process_crate::h6bb0baa6752a5ec0
  38:     0x7f4f61254967 - rustc_session::utils::<impl rustc_session::session::Session>::time::h88db1609c8457239
  39:     0x7f4f62e13637 - rustc_interface::passes::QueryContext::enter::hcdbb877939d5b3f6
  40:     0x7f4f62dfa901 - rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter::h5e6d4aaebb0cf9be
  41:     0x7f4f62de7f9c - rustc_span::with_source_map::h599a6f9fdaefef48
  42:     0x7f4f62dfa22c - scoped_tls::ScopedKey<T>::set::he21a81a9bfc3d569
  43:     0x7f4f62de96ba - std::sys_common::backtrace::__rust_begin_short_backtrace::h81ba4b768f16a523
  44:     0x7f4f62de6865 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h83206074d599cea9
  45:     0x7f4f60a72e33 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h59eef3b9c8a82350
                               at /rustc/6c33a0a2ec8a32016fcb35342ae9d08087e38d5c/library/alloc/src/boxed.rs:1636:9
  46:     0x7f4f60a72e33 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hb5bbe017c347469c
                               at /rustc/6c33a0a2ec8a32016fcb35342ae9d08087e38d5c/library/alloc/src/boxed.rs:1636:9
  47:     0x7f4f60a72e33 - std::sys::unix::thread::Thread::new::thread_start::h62931528f61e35f5
                               at /rustc/6c33a0a2ec8a32016fcb35342ae9d08087e38d5c/library/std/src/sys/unix/thread.rs:106:17
  48:     0x7f4f6097f259 - start_thread
  49:     0x7f4f608945e3 - __GI___clone
  50:                0x0 - <unknown>

error: internal compiler error: unexpected panic

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 1.57.0-nightly (6c33a0a2e 2021-09-18) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z save-analysis

query stack during panic:
#0 [typeck] type-checking `main`
end of query stack
error: aborting due to 6 previous errors

Some errors have detailed explanations: E0107, E0392.
For more information about an error, try `rustc --explain E0107`.

[Alexendoo]

No longer ICEs since #91847