ICE: no type for local variable local _=m

[Badel2]

I'm seeing an internal compiler error on the following input, found by fuzz-rustc:

Code

fn r({){Ok{d..||_=m

Error output

error: internal compiler error: compiler/rustc_typeck/src/check/fn_ctxt/_impl.rs:139:13: no type for local variable local _=m (hir_id=HirId { owner: DefId(0:3 ~ playground[b6e0]::r), local_id: 6 })
 --> src/lib.rs:1:17
  |
1 | fn r({){Ok{d..||_=m
  |                 ^^^

thread 'rustc' panicked at 'Box<dyn Any>', /rustc/cfa3fe5af339e724209b25715282adae0c61628f/compiler/rustc_errors/src/lib.rs:1115:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

The ICE happens after reporting some other errors, and the input is not syntactically correct (fn r({)), so low priority. Affected versions: I tried nightly 2021-12-31 and stable 1.57 and they both show the same ICE.

Backtrace

   Compiling playground v0.0.1 (/playground)
error: this file contains an unclosed delimiter
 --> src/main.rs:1:20
  |
1 | fn r({){Ok{d..||_=m
  |        -  -        ^
  |        |  |
  |        |  unclosed delimiter
  |        unclosed delimiter

error: expected parameter name, found `{`
 --> src/main.rs:1:6
  |
1 | fn r({){Ok{d..||_=m
  |      ^ expected parameter name

error: expected one of `,` or `}`, found `..`
 --> src/main.rs:1:6
  |
1 | fn r({){Ok{d..||_=m
  |      ^      -^
  |      |      |
  |      |      help: `}` may belong here
  |      unclosed delimiter

error[E0425]: cannot find value `d` in this scope
 --> src/main.rs:1:12
  |
1 | fn r({){Ok{d..||_=m
  |            ^ not found in this scope

error[E0425]: cannot find value `m` in this scope
 --> src/main.rs:1:19
  |
1 | fn r({){Ok{d..||_=m
  |                   ^ not found in this scope

error[E0559]: variant `Result<_, _>::Ok` has no field named `d`
   --> src/main.rs:1:12
    |
1   | fn r({){Ok{d..||_=m
    |            ^ field does not exist
    |
help: `Result<_, _>::Ok` is a tuple variant, use the appropriate syntax
    |
1   | fn r({){Result<_, _>::Ok(/* fields */)
    |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

error[E0308]: mismatched types
 --> src/main.rs:1:9
  |
1 | fn r({){Ok{d..||_=m
  |        -^^^^^^^^^^^ expected `()`, found enum `Result`
  |        |
  |        possibly return type missing here?
  |
  = note: expected unit type `()`
                  found enum `Result<_, _>`

error: internal compiler error: compiler/rustc_typeck/src/check/fn_ctxt/_impl.rs:139:13: no type for local variable local _=m (hir_id=HirId { owner: DefId(0:3 ~ playground[87de]::r), local_id: 6 })
 --> src/main.rs:1:17
  |
1 | fn r({){Ok{d..||_=m
  |                 ^^^

thread 'rustc' panicked at 'Box<dyn Any>', /rustc/cfa3fe5af339e724209b25715282adae0c61628f/compiler/rustc_errors/src/lib.rs:1115:9
stack backtrace:
   0: std::panicking::begin_panic::<rustc_errors::ExplicitBug>
   1: std::panic::panic_any::<rustc_errors::ExplicitBug>
   2: <rustc_errors::HandlerInner>::span_bug::<rustc_span::span_encoding::Span>
   3: <rustc_errors::Handler>::span_bug::<rustc_span::span_encoding::Span>
   4: rustc_middle::ty::context::tls::with_opt::<rustc_middle::util::bug::opt_span_bug_fmt<rustc_span::span_encoding::Span>::{closure#0}, ()>
   5: rustc_middle::util::bug::opt_span_bug_fmt::<rustc_span::span_encoding::Span>
   6: rustc_middle::util::bug::span_bug_fmt::<rustc_span::span_encoding::Span>
   7: <rustc_typeck::check::writeback::WritebackCx as rustc_hir::intravisit::Visitor>::visit_local
   8: <rustc_typeck::check::writeback::WritebackCx as rustc_hir::intravisit::Visitor>::visit_expr
   9: <rustc_typeck::check::writeback::WritebackCx as rustc_hir::intravisit::Visitor>::visit_expr
  10: <rustc_typeck::check::writeback::WritebackCx as rustc_hir::intravisit::Visitor>::visit_expr
  11: <rustc_typeck::check::writeback::WritebackCx as rustc_hir::intravisit::Visitor>::visit_expr
  12: <rustc_typeck::check::fn_ctxt::FnCtxt>::resolve_type_vars_in_body
  13: <rustc_infer::infer::InferCtxtBuilder>::enter::<&rustc_middle::ty::context::TypeckResults, <rustc_typeck::check::inherited::InheritedBuilder>::enter<rustc_typeck::check::typeck_with_fallback<rustc_typeck::check::typeck::{closure#0}>::{closure#1}, &rustc_middle::ty::context::TypeckResults>::{closure#0}>
  14: rustc_typeck::check::typeck
  15: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::plumbing::QueryCtxt, rustc_query_system::query::caches::DefaultCache<rustc_span::def_id::LocalDefId, &rustc_middle::ty::context::TypeckResults>>
  16: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::typeck
  17: rustc_typeck::check::typeck
  18: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::plumbing::QueryCtxt, rustc_query_system::query::caches::DefaultCache<rustc_span::def_id::LocalDefId, &rustc_middle::ty::context::TypeckResults>>
  19: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::typeck
  20: <rustc_middle::hir::map::Map>::par_body_owners::<rustc_typeck::check::typeck_item_bodies::{closure#0}>
  21: rustc_typeck::check::typeck_item_bodies
  22: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::plumbing::QueryCtxt, rustc_query_system::query::caches::DefaultCache<(), ()>>
  23: rustc_query_system::query::plumbing::get_query::<rustc_query_impl::queries::typeck_item_bodies, rustc_query_impl::plumbing::QueryCtxt>
  24: <rustc_session::session::Session>::time::<(), rustc_typeck::check_crate::{closure#7}>
  25: rustc_typeck::check_crate
  26: rustc_interface::passes::analysis
  27: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::plumbing::QueryCtxt, rustc_query_system::query::caches::DefaultCache<(), core::result::Result<(), rustc_errors::ErrorReported>>>
  28: rustc_query_system::query::plumbing::get_query::<rustc_query_impl::queries::analysis, rustc_query_impl::plumbing::QueryCtxt>
  29: <rustc_interface::passes::QueryContext>::enter::<rustc_driver::run_compiler::{closure#1}::{closure#2}::{closure#3}, core::result::Result<(), rustc_errors::ErrorReported>>
  30: <rustc_interface::interface::Compiler>::enter::<rustc_driver::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_errors::ErrorReported>>
  31: rustc_span::with_source_map::<core::result::Result<(), rustc_errors::ErrorReported>, rustc_interface::interface::create_compiler_and_run<core::result::Result<(), rustc_errors::ErrorReported>, rustc_driver::run_compiler::{closure#1}>::{closure#1}>
  32: rustc_interface::interface::create_compiler_and_run::<core::result::Result<(), rustc_errors::ErrorReported>, rustc_driver::run_compiler::{closure#1}>
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 1.59.0-nightly (cfa3fe5af 2021-12-31) running on x86_64-unknown-linux-gnu

note: compiler flags: -C embed-bitcode=no -C codegen-units=1 -C debuginfo=2 --crate-type bin

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
#0 [typeck] type-checking `r`
#1 [typeck] type-checking `r::{closure#0}`
#2 [typeck_item_bodies] type-checking all item bodies
#3 [analysis] running analysis passes on this crate
end of query stack
Some errors have detailed explanations: E0308, E0425, E0559.
For more information about an error, try `rustc --explain E0308`.
error: could not compile `playground` due to 7 previous errors

[terrarier2111]

@rustbot claim

[JohnTitor]

Triage: this has been fixed since nightly-2022-12-09, marking as E-needs-test.