ICE: no def-id for fresh lifetime #126850
Description
auto-reduced (treereduce-rust):
fn bug<T>() -> impl Iterator< Item = [(); { |found: &String| Some(false); 4 }], > { std::iter::empty() } fn main() {} original:
#![allow(unused_must_use)] fn bug<T>() -> impl Iterator<Item = [(); { |found: &String| Some(false); 4 }]> { std::iter::empty() } fn ok<T>() -> Box<dyn Iterator<Item = [(); { |x: u32| { x }; 4 }]>> { Box::new(std::iter::empty()) } fn main() { for _item in ok::<u32>() {} for _item in bug::<u32>() {} }Version information
rustc 1.81.0-nightly (acb62737a 2024-06-23) binary: rustc commit-hash: acb62737aca7045f331e7a05adc38bed213e278d commit-date: 2024-06-23 host: x86_64-unknown-linux-gnu release: 1.81.0-nightly LLVM version: 18.1.7 Command:
/home/matthias/.rustup/toolchains/master/bin/rustc -Zincremental-verify-ich=yes -Cincremental=<dir> -Cdebuginfo=2
Program output
warning: unused variable: `found` --> /tmp/icemaker_global_tempdir.fh96CiIOsxK3/rustc_testrunner_tmpdir_reporting.U9ifJLvY9ftQ/mvce.rs:3:17 | 3 | |found: &String| Some(false); | ^^^^^ help: if this is intentional, prefix it with an underscore: `_found` | = note: `#[warn(unused_variables)]` on by default warning: function `bug` is never used --> /tmp/icemaker_global_tempdir.fh96CiIOsxK3/rustc_testrunner_tmpdir_reporting.U9ifJLvY9ftQ/mvce.rs:1:4 | 1 | fn bug<T>() -> impl Iterator< | ^^^ | = note: `#[warn(dead_code)]` on by default warning: unused closure that must be used --> /tmp/icemaker_global_tempdir.fh96CiIOsxK3/rustc_testrunner_tmpdir_reporting.U9ifJLvY9ftQ/mvce.rs:3:16 | 3 | |found: &String| Some(false); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: closures are lazy and do nothing unless called = note: `#[warn(unused_must_use)]` on by default warning: 3 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: no def-id for fresh lifetime --> /tmp/icemaker_global_tempdir.fh96CiIOsxK3/rustc_testrunner_tmpdir_reporting.U9ifJLvY9ftQ/mvce.rs:3:24 | 3 | |found: &String| Some(false); | ^^^^^^^ | note: delayed at compiler/rustc_ast_lowering/src/lib.rs:1650:30 - disabled backtrace --> /tmp/icemaker_global_tempdir.fh96CiIOsxK3/rustc_testrunner_tmpdir_reporting.U9ifJLvY9ftQ/mvce.rs:3:24 | 3 | |found: &String| Some(false); | ^^^^^^^ 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 1.81.0-nightly (acb62737a 2024-06-23) running on x86_64-unknown-linux-gnu note: compiler flags: -Z incremental-verify-ich=yes -C incremental=[REDACTED] -C debuginfo=2 query stack during panic: end of query stack