CPP: More tests of isSideEffectFree() / ExprHasNoEffect.ql#641
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The first part of this is a test case from https://git.semmle.com/Semmle/code/pull/19744/commits/c7f56d2588bf00060e2969050a493e3c8f4b144c (never merged) about how
isSideEffectFree()handles the presence of anErrorExpr. The test now produces the results I'd expect (in particular the third case, which like the second contains anErrorExprso cannot be assumed to be side-effect free).The second part of this PR is a simple test case for 'Expression has no effect' on
CommaExpr, a subject that's been discussed lately. In fact we already had some test cases but the new ones are clearer.@rdmarsh2