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I often use tup / ninja as build systems which pipe input into an internal buffer and only later send it to stdout,
Rustc disables coloring when it's piped into any other source. Hence, I lose all coloring when using rust with tup.
Clang has the same behaviour by default, but provides a compiler flag -f-color-diagnostics which forces colored output to be emitted. This would be really useful to have in rustc. It makes debugging and in general compiling far more pleasant.