rustc crashes when printing target list to invalid pipe on macos

[Dentosal]

I ran this command:

rustc --print target-list | xyz

I expected to see this happen:

An error message about pipe broken pipe, or no output.

Instead, this happened:

$ rustc --print target-list | xyz
-bash: xyz: command not found
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 1.25.0-nightly (3bd4af88b 2018-01-18) running on x86_64-apple-darwin

thread 'rustc' panicked at 'failed printing to stdout: Broken pipe (os error 32)', libstd/io/stdio.rs:690:9
note: Run with `RUST_BACKTRACE=1` for a backtrace.

Meta

rustc --version --verbose:

$ rustc --version --verbose
rustc 1.25.0-nightly (3bd4af88b 2018-01-18)
binary: rustc
commit-hash: 3bd4af88bea2e6ecdd3455ed89b3ef1fc3500aa4
commit-date: 2018-01-18
host: x86_64-apple-darwin
release: 1.25.0-nightly
LLVM version: 4.0

Backtrace:

thread 'rustc' panicked at 'failed printing to stdout: Broken pipe (os error 32)', libstd/io/stdio.rs:690:9
stack backtrace:
   0:        0x1151d465b - std::sys::unix::backtrace::tracing::imp::unwind_backtrace::h419918b185546cd5
   1:        0x1151de4c4 - std::sys_common::backtrace::print::h95585d41a1966254
   2:        0x1151c0e50 - std::panicking::default_hook::{{closure}}::h3f11af6d88cbf44d
   3:        0x1151c0935 - std::panicking::default_hook::h363464b46ee98ef1
   4:        0x1151c12d6 - std::panicking::rust_panic_with_hook::h407d06fffbe934da
   5:        0x1151c112e - std::panicking::begin_panic::h920e256577b254d6
   6:        0x1151c1083 - std::panicking::begin_panic_fmt::h90b1bd692861f55b
   7:        0x1151c5d21 - std::io::stdio::_print::h1b11ed6c4298c9d2
   8:        0x10eeedcc2 - rustc_driver::RustcDefaultCalls::print_crate_info::h740def1787ac21db
   9:        0x10eeeb365 - <rustc_driver::RustcDefaultCalls as rustc_driver::CompilerCalls<'a>>::no_input::h113cc58422cdf9dd
  10:        0x10eee7bf5 - rustc_driver::run_compiler::h2396d8175e83b8c8
  11:        0x10ee14971 - std::sys_common::backtrace::__rust_begin_short_backtrace::hb17c49d1c538ce03
  12:        0x11520521e - __rust_maybe_catch_panic
  13:        0x10ee5c38d - <F as alloc::boxed::FnBox<A>>::call_box::h5f46c789ab10a85d
  14:        0x1151e0ef7 - std::sys_common::thread::start_thread::h72beb878126afdad
  15:        0x1151eb208 - std::sys::unix::thread::Thread::new::thread_start::h2c9c3fd3c5fb7727
  16:     0x7fff8a63399c - _pthread_body
  17:     0x7fff8a633919 - _pthread_start

[varkor]

Duplicate of #34376.

[Mark-Simulacrum]

Yes, closing in favor of #34376.