Put "Error:" before error output

[Konstantine Rybnikov]

Hi!

I'm bringing this up once again. Can we add "Error:" in the output of an
error in a similar way ghc shows "Warning:" for warnings? Main reasoning is
that, for example, on a build-server, where you have lots of cores to build
your program, if you get an error, it gets lost somewhere in the middle of
compiler's output in all other "Warning" messages you get, since error is
not always shown last on multi-core build.

Thanks.
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