ICE: `entered unreachable code: parse_dot_or_call_expr_with_ shouldn't produce this`

[cushionbadak]

Code

fn main() {
    foo::bar as baz.yield
}

Original mutant

fn main() {
    marco_use::bar::quux as cal.yield &a {};
}

A mutant of glacier2's fixed/123383-1.rs.

Meta

rustc --version --verbose:

rustc 1.90.0-nightly (ce5fdd7d4 2025-07-26)
binary: rustc
commit-hash: ce5fdd7d42aba9a2925692e11af2bd39cf37798a
commit-date: 2025-07-26
host: aarch64-apple-darwin
release: 1.90.0-nightly
LLVM version: 20.1.8

Error output

Command: rustc

thread 'rustc' panicked at compiler/rustc_parse/src/parser/expr.rs:790:26:
internal error: entered unreachable code: parse_dot_or_call_expr_with_ shouldn't produce this

Backtrace

thread 'rustc' panicked at compiler/rustc_parse/src/parser/expr.rs:790:26:
internal error: entered unreachable code: parse_dot_or_call_expr_with_ shouldn't produce this
stack backtrace:
   0:        0x10eddd320 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h1594c8453712981c
   1:        0x10c2bed80 - core::fmt::write::h34cb90876f5d64c5
   2:        0x10edd1958 - std::io::Write::write_fmt::h7e817f1d11c8efad
   3:        0x10eddd1e0 - std::sys::backtrace::BacktraceLock::print::h333d5c96a4c6ae9f
   4:        0x10ede1d94 - std::panicking::default_hook::{{closure}}::hbd90616774065468
   5:        0x10ede1a6c - std::panicking::default_hook::h6af1ee91e8c02d13
   6:        0x10ceac424 - rustc_driver_impl[958a68ac8616d6a4]::install_ice_hook::{closure#1}
   7:        0x10ede2720 - std::panicking::rust_panic_with_hook::h90248fc01dca11c1
   8:        0x10ede22e0 - std::panicking::begin_panic_handler::{{closure}}::h2ad3db39166c496b
   9:        0x10eddd7bc - std::sys::backtrace::__rust_end_short_backtrace::hdbd09c712056bfdb
  10:        0x10ede200c - __rustc[3aaae60b58908e19]::rust_begin_unwind
  11:        0x111a1e4a8 - core::panicking::panic_fmt::h19107e67a72fa5ac
  12:        0x10dfec4d0 - <rustc_parse[c767a5a077b54cd6]::parser::Parser>::parse_expr_assoc_rest_with
  13:        0x10dfc94e4 - <rustc_parse[c767a5a077b54cd6]::parser::Parser>::collect_tokens::<rustc_ast[d31bd7a6480b90b8]::ast::Stmt, <rustc_parse[c767a5a077b54cd6]::parser::Parser>::parse_stmt_without_recovery::{closure#4}>
  14:        0x10e06a60c - <rustc_parse[c767a5a077b54cd6]::parser::Parser>::parse_stmt_without_recovery
  15:        0x10e071b98 - <rustc_parse[c767a5a077b54cd6]::parser::Parser>::parse_full_stmt
  16:        0x10e070a7c - <rustc_parse[c767a5a077b54cd6]::parser::Parser>::parse_block_tail
  17:        0x10e070204 - <rustc_parse[c767a5a077b54cd6]::parser::Parser>::parse_block_common
  18:        0x10e04808c - <rustc_parse[c767a5a077b54cd6]::parser::Parser>::parse_fn_body
  19:        0x10e047d48 - <rustc_parse[c767a5a077b54cd6]::parser::Parser>::parse_fn
  20:        0x10e02d7c4 - <rustc_parse[c767a5a077b54cd6]::parser::Parser>::parse_item_kind
  21:        0x10e02afa0 - <rustc_parse[c767a5a077b54cd6]::parser::Parser>::parse_item_common
  22:        0x10e02a998 - <rustc_parse[c767a5a077b54cd6]::parser::Parser>::parse_item_
  23:        0x10e029f40 - <rustc_parse[c767a5a077b54cd6]::parser::Parser>::parse_mod
  24:        0x10d789a28 - rustc_interface[edc599394d0ba7e4]::passes::parse
  25:        0x10ce5cb78 - rustc_interface[edc599394d0ba7e4]::interface::run_compiler::<(), rustc_driver_impl[958a68ac8616d6a4]::run_compiler::{closure#0}>::{closure#1}
  26:        0x10ce524dc - std[2e8331686e48b1eb]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[edc599394d0ba7e4]::util::run_in_thread_with_globals<rustc_interface[edc599394d0ba7e4]::util::run_in_thread_pool_with_globals<rustc_interface[edc599394d0ba7e4]::interface::run_compiler<(), rustc_driver_impl[958a68ac8616d6a4]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
  27:        0x10ce5f344 - <<std[2e8331686e48b1eb]::thread::Builder>::spawn_unchecked_<rustc_interface[edc599394d0ba7e4]::util::run_in_thread_with_globals<rustc_interface[edc599394d0ba7e4]::util::run_in_thread_pool_with_globals<rustc_interface[edc599394d0ba7e4]::interface::run_compiler<(), rustc_driver_impl[958a68ac8616d6a4]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[c38aea140a3b1cee]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  28:        0x10ede5a90 - std::sys::pal::unix::thread::Thread::new::thread_start::hb8819dabb00c668a
  29:        0x18759ac0c - __pthread_cond_wait

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

note: please attach the file at `/Users/jb/workspace/run_250725_250515_icemaker_perfeval_gb_34h/scratch/rustc-ice-2025-07-27T07_27_46-80438.txt` to your bug report

query stack during panic:
end of query stack

Notes

ICE ___location: compiler/rustc_parse/src/parser/expr.rs Line-790

rust/compiler/rustc_parse/src/parser/expr.rs

Lines 777 to 791 in ce5fdd7

	if !matches!(with_postfix.kind, ExprKind::Cast(_, _)) {
	let msg = format!(
	"cast cannot be followed by {}",
	match with_postfix.kind {
	ExprKind::Index(..) => "indexing",
	ExprKind::Try(_) => "`?`",
	ExprKind::Field(_, _) => "a field access",
	ExprKind::MethodCall(_) => "a method call",
	ExprKind::Call(_, _) => "a function call",
	ExprKind::Await(_, _) => "`.await`",
	ExprKind::Use(_, _) => "`.use`",
	ExprKind::Match(_, _, MatchKind::Postfix) => "a postfix match",
	ExprKind::Err(_) => return Ok(with_postfix),
	_ => unreachable!("parse_dot_or_call_expr_with_ shouldn't produce this"),
	}

[cyrgani]

fn main() {
    0 as u8.yield
}