Panic when piping rustc output to a non existent program

[farnasirim]

$rustc --version
rustc 1.8.0

Here is the problem:

$rustc --explain E0308 | lessw
zsh: command not found: lessw
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: run with `RUST_BACKTRACE=1` for a backtrace
thread '<main>' panicked at 'failed printing to stdout: Broken pipe (os error 32)', src/libstd/io/stdio.rs:626

[alexcrichton]

I believe this is a dupe of #30972 closed in favor of #14505 which is fixed on nightly