Problem

^title

I expect that with --color=always option (or CARGO_TERM_COLOR=always environment variable) the output will contain expected ANSI escape codes.

Steps

1. Run cargo build --color=always --unknown &> out.txt
2. Theout.txt will contain the following output (without ANSI escape codes):

error: Found argument '--unknown' which wasn't expected, or isn't valid in this context

USAGE:
    cargo build --color <WHEN>

For more information try --help

Notes

Output of cargo version:

cargo 1.50.0-nightly (a3c2627fb 2020-12-14)