Internal compiler error: unexpected panic

[saresend]

I was working on cross compiling rust and I ran into the issue in the title. I was trying to run the following function:
rustc --print target-list | pr -tw100 --columns 3
When it panicked.

Rust Version: rustc 1.20.0 (f3d6973f4 2017-08-27) running on x86_64-apple-darwin

if it helps, the piped pr command gave the following output:
pr: illegal option -- -

And here is the panic error from rust:

thread 'rustc' panicked at 'failed printing to stdout: Broken pipe (os error 32)', src/libstd/io/stdio.rs:692:8

[sinkuu]

Duplication of #34376?

[estebank]

Closing as duplicate of #34376.