$ rustc -Vv
rustc 1.36.0 (a53f9df32 2019-07-03)
binary: rustc
commit-hash: a53f9df32fbb0b5f4382caaad8f1a46f36ea887c
commit-date: 2019-07-03
host: x86_64-apple-darwin
release: 1.36.0
LLVM version: 8.0

$ echo Zm4gbWFpbigo2Lw= | base64 -D > main.rs

$ rustc main.rs
error: this file contains an un-closed delimiter
 --> main.rs:1:11
  |
1 | fn main((ؼ
  |        -- ^
  |        ||
  |        |un-closed delimiter
  |        un-closed delimiter

thread 'rustc' panicked at 'byte index 10 is not a char boundary; it is inside 'ؼ' (bytes 9..11) of `fn main((ؼ`', src/libcore/str/mod.rs:2034:5
note: Run with `RUST_BACKTRACE=1` environment variable to display a backtrace.
error: aborting due to previous error


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/blob/master/CONTRIBUTING.md#bug-reports

note: rustc 1.36.0 (a53f9df32 2019-07-03) running on x86_64-apple-darwin