lessc writes error output to stdout

[ianthehenry]

When something goes wrong, lessc writes to stdout, not to stderr

For a simple repro, you can just invoke lessc | wc -c. Should be zero, as the error message should be written to stderr.

(This issue originally included that lessc wasn't setting an erroneous exit code. It seems I was testing it wrong, and lessc does do the right thing there. Not sure what I did...)

Okay, edit 3: some errors don't correctly set an exit code. Here's one example:

$ node_modules/.bin/lessc --include-path
include-path option requires a parameter
$ echo $?
0

But others do. An interesting roulette when using lessc from build scripts.