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The effect on compiler robustness of high volume randomized testing is also very significant, I think. This was post-1996 (McKeeman in 1998).

CSmith [0] also made significant strides in that area.

Of course (and jsfunfuzz in 2007, and some others, and now a continuing stream of elaboration and improvement.)

I think this made it easier to firm up new language implementations. I feel like we started getting more of them because of this.