Internal Compiler Error 'assertion failed: bpos.to_u32() >= mbc.pos.to_u32() + mbc.bytes as u32' · Issue #84104 · rust-lang/rust (original) (raw)

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Description

I'm seeing an internal compiler error on the following input (found by fuzz-rustc):

$ rustc bug.rs
error: this file contains an unclosed delimiter
 --> bug.rs:1:13
  |
1 | #[i=i::<ښܖ<
  |  -          ^
  |  |
  |  unclosed delimiter

thread 'rustc' panicked at 'assertion failed: bpos.to_u32() >= mbc.pos.to_u32() + mbc.bytes as u32', compiler/rustc_span/src/lib.rs:1505:17
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 1.53.0-nightly (a836d9b64 2021-04-10) running on x86_64-unknown-linux-gnu

query stack during panic:
end of query stack
error: aborting due to previous error