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thanks for the PR. can you also add a unit test to https://github.com/Microsoft/TypeScript/blob/master/src/harness/unittests/tsconfigParsing.ts

Yeah, I'll give it a try.

Beginners question: What's the right way to call gulp runtests?

I tried gulp runtests --tests=src/harness/unittests/tsconfigParsing.ts and quite a few others, but the output is always something like 0 passing (57ms) even so I definitely created a failing testcase: assert.isTrue(false, "should fail")

Because it's "0 passing", I assume I chose the wrong format for the tests argument and no test runs at all.

Nevermind, gulp runtests --tests=parseConfigFileTextToJson it is :)
Was easy to see after the full test finally broke after ages of running.

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