'called `Result::unwrap_err()` on an `Ok` value: false', compiler/rustc_builtin_macros/src/format.rs:173:51
dwrensha opened this issue · 2 comments
dwrensha commented
I'm seeing an internal compiler error on the following input, found by fuzz-rustc:
fn m(){print!("",(c for&g
u
e
e$ rustc bug.rs
error: this file contains an unclosed delimiter
--> bug.rs:4:2
|
1 | fn m(){print!("",(c for&g
| - - - unclosed delimiter
| | |
| | unclosed delimiter
| unclosed delimiter
...
4 | e
| ^
error: missing `in` in `for` loop
--> bug.rs:1:26
|
1 | fn m(){print!("",(c for&g
| __________________________^
2 | | u
| |_ help: try adding `in` here
error: expected one of `!`, `)`, `,`, `.`, `::`, `?`, `{`, or an operator, found keyword `for`
--> bug.rs:1:21
|
1 | fn m(){print!("",(c for&g
| ^^^ expected one of 8 possible tokens
error: expected `;`, found `e`
--> bug.rs:3:2
|
3 | e
| ^ help: add `;` here
4 | e
| - unexpected token
thread 'rustc' panicked at 'called `Result::unwrap_err()` on an `Ok` value: false', compiler/rustc_builtin_macros/src/format.rs:173:51
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 (fdf65053e 2021-09-07) running on x86_64-unknown-linux-gnu
query stack during panic:
end of query stack
error: aborting due to 4 previous errors
dwrensha commented
searched nightlies: from nightly-2021-05-10 to nightly-2021-09-08
regressed nightly: nightly-2021-07-28
searched commits: from 08095fc to 2faabf5
regressed commit: 8bebfe5
bisected with cargo-bisect-rustc v0.6.0
Host triple: x86_64-unknown-linux-gnu
Reproduce with:
cargo bisect-rustc --start=2021-5-10 --end=2021-09-08 --regress ice