ICE: called Result::unwrap() on an Err value: ParseIntError { kind: PosOverflow } in rustc_builtin_macros/src/format_foreign.rs #137580
Description
Code
Be aware of quotation mark locations.
fn main() {
println!("%100000$, 1);
println!(s% 65536", 1337f64);
}Original Code (Mutant from Fuzzing)
fn main() {
println!("%100000$, 1);
//~^ ERROR argument never used
println!(s% 65536", 1337f64);
//~^ ERROR argument never used
}
// /home/jb/workspace/seeds_250219/tests/ui/macros/println-percent-prefix-num-issue-125002.rsMeta
rustc --version --verbose:
rustc 1.87.0-nightly (617aad8c2 2025-02-24)
binary: rustc
commit-hash: 617aad8c2e8783f6df8e5d1f8bb1e4bcdc70aa7b
commit-date: 2025-02-24
host: x86_64-apple-darwin
release: 1.87.0-nightly
LLVM version: 20.1.0
Error output
thread 'rustc' panicked at compiler/rustc_builtin_macros/src/format_foreign.rs:417:85:
called `Result::unwrap()` on an `Err` value: ParseIntError { kind: PosOverflow }
Backtrace
thread 'rustc' panicked at compiler/rustc_builtin_macros/src/format_foreign.rs:417:85:
called `Result::unwrap()` on an `Err` value: ParseIntError { kind: PosOverflow }
stack backtrace:
0: _rust_begin_unwind
1: core::panicking::panic_fmt
2: core::result::unwrap_failed
3: <rustc_builtin_macros::format_foreign::printf::Substitutions as core::iter::traits::iterator::Iterator>::next
4: rustc_builtin_macros::format::make_format_args
5: rustc_builtin_macros::format::expand_format_args_impl
6: <rustc_expand::expand::MacroExpander>::expand_invoc
7: <rustc_expand::expand::MacroExpander>::fully_expand_fragment
8: <rustc_expand::expand::MacroExpander>::expand_crate
9: rustc_interface::passes::resolver_for_lowering_raw
[... omitted 2 frames ...]
10: rustc_interface::passes::create_and_enter_global_ctxt::<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2}>
11: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
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 `/Volumes/T7/workspace/250225 scratch/codes/rustc-ice-2025-02-25T03_39_56-16081.txt` to your bug report
query stack during panic:
#0 [resolver_for_lowering_raw] getting the resolver for lowering
end of query stack
Note
- ICE location:
compiler/rustc_builtin_macros/src/format_foreign.rs Line-417
rust/compiler/rustc_builtin_macros/src/format_foreign.rs
Lines 409 to 419 in 617aad8