Commits on Nov 8, 2018

1. rustc: Request ansi colors if stderr isn't a tty …

   Currently Cargo will always capture the output of rustc meaning that
   rustc is never hooked up to a tty. To retain colors Cargo uses the
   `fwdansi` crate to ensure that ansi color codes are translated to
   windows terminal methods (and ansi codes otherwise just go their natural
   route on Unix).
   
   Cargo passes `--color always` to rustc to ensure that using a pipe
   doesn't trick it into not emitting colors at all. It turns out, however,
   that `--color always` ends up still accidentally using the native shell
   api on native windows shells.
   
   The fix here is to instead pass `AlwaysAnsi` to `termcolor` instead of
   `Always`, ensuring that when `--color always` is passed to rustc and its
   output isn't a terminal, we're always generating ansi colors regardless
   of the platform.
   
   Closes rust-lang#55769

   

   alexcrichton committed Nov 8, 2018
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