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Re:MSVC's implementation of the C++ Standard Library by Avery3R on Monday September 16, 2019 @09:56PM (#20990466)
Parts of the CRT are closed source, headers are shippped as a part of MSVC.

(Edited after correction)

Re:MSVC's implementation of the C++ Standard Library by adzm on Monday September 16, 2019 @09:57PM (#20990473)
The source is also shipped as part of the Windows SDK.