Long delay before exiting after reporting compilation errors in rustc 1.14.0 nightly when RUST_BACKTRACE=1 #37477
Description
When I have any compilation error(s) there is a rather long delay (around 14s on my machine) before rustc finally exits. Successful compilation is very fast.
I am on Ubuntu 16.04 in VMware Workstation 12.5 for Windows virtual machine.
Steps to reproduce:
$ touch test.rs
$ time rustc test.rs
error: main function not found
error: aborting due to previous error
real 0m13.423s
user 0m13.276s
sys 0m0.112s
Meta
rustc --version --verbose:
rustc 1.14.0-nightly (3f4408347 2016-10-27)
binary: rustc
commit-hash: 3f4408347d2109803edbf53c89c8bce575de4b67
commit-date: 2016-10-27
host: x86_64-unknown-linux-gnu
release: 1.14.0-nightly
LLVM version: 3.9
shepmaster, ideasman42, konstin and kirillkh