ICE: internal compiler error: coercion error but no error emitted #134355

warning: unnecessary braces around `return` value
 --> /tmp/icemaker_global_tempdir.QVsadqybRl15/rustc_testrunner_tmpdir_reporting.Ov3ZSIZ9UPa5/mvce.rs:2:12
  |
2 |     return { i32::MIN };
  |            ^^        ^^
  |
  = note: `#[warn(unused_braces)]` on by default
help: remove these braces
  |
2 -     return { i32::MIN };
2 +     return i32::MIN;
  |

warning: function `digit` is never used
 --> /tmp/icemaker_global_tempdir.QVsadqybRl15/rustc_testrunner_tmpdir_reporting.Ov3ZSIZ9UPa5/mvce.rs:1:4
  |
1 | fn digit() -> str {
  |    ^^^^^
  |
  = note: `#[warn(dead_code)]` on by default

warning: 2 warnings emitted

note: no errors encountered even though delayed bugs were created

note: those delayed bugs will now be shown as internal compiler errors

error: internal compiler error: coercion error but no error emitted
 --> /tmp/icemaker_global_tempdir.QVsadqybRl15/rustc_testrunner_tmpdir_reporting.Ov3ZSIZ9UPa5/mvce.rs:2:14
  |
2 |     return { i32::MIN };
  |              ^^^^^^^^
  |
note: delayed at compiler/rustc_hir_typeck/src/coercion.rs:1666:31 - disabled backtrace
 --> /tmp/icemaker_global_tempdir.QVsadqybRl15/rustc_testrunner_tmpdir_reporting.Ov3ZSIZ9UPa5/mvce.rs:2:14
  |
2 |     return { i32::MIN };
  |              ^^^^^^^^

error: internal compiler error[E0308]: mismatched types
 --> /tmp/icemaker_global_tempdir.QVsadqybRl15/rustc_testrunner_tmpdir_reporting.Ov3ZSIZ9UPa5/mvce.rs:2:14
  |
1 | fn digit() -> str {
  |               --- expected `str` because of return type
2 |     return { i32::MIN };
  |              ^^^^^^^^ expected `str`, found `i32`
  |
note: delayed at compiler/rustc_trait_selection/src/error_reporting/infer/mod.rs:2038:35 - disabled backtrace
 --> /tmp/icemaker_global_tempdir.QVsadqybRl15/rustc_testrunner_tmpdir_reporting.Ov3ZSIZ9UPa5/mvce.rs:2:14
  |
2 |     return { i32::MIN };
  |              ^^^^^^^^

error: internal compiler error[E0277]: the size for values of type `str` cannot be known at compilation time
 --> /tmp/icemaker_global_tempdir.QVsadqybRl15/rustc_testrunner_tmpdir_reporting.Ov3ZSIZ9UPa5/mvce.rs:1:15
  |
1 | fn digit() -> str {
  |               ^^^ doesn't have a size known at compile-time
  |
  = help: the trait `Sized` is not implemented for `str`
  = note: the return type of a function must have a statically known size
note: delayed at compiler/rustc_trait_selection/src/error_reporting/traits/fulfillment_errors.rs:259:39 - disabled backtrace
 --> /tmp/icemaker_global_tempdir.QVsadqybRl15/rustc_testrunner_tmpdir_reporting.Ov3ZSIZ9UPa5/mvce.rs:1:15
  |
1 | fn digit() -> str {
  |               ^^^

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: please make sure that you have updated to the latest nightly

note: rustc 1.85.0-nightly (d18506299 2024-12-15) running on x86_64-unknown-linux-gnu

note: compiler flags: --crate-type lib -Z dump-mir-dir=dir

query stack during panic:
end of query stack