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std: Prevent print panics when using TLS #29491

Merged

bors merged 1 commit into rust-lang:master from alexcrichton:avoid-stdio-tls

Nov 6, 2015

Commits on Oct 31, 2015

std: Prevent print panics when using TLS

Currently if a print happens while a thread is being torn down it may cause a
panic if the LOCAL_STDOUT TLS slot has been destroyed by that point. This adds a
guard to check and prints to the process stdout if that's the case (as we do for
if the slot is already borrowed).

Closes rust-lang#29488

alexcrichton committed Oct 31, 2015