Aaron Ballman 403d7d8d70 Ignore FullExpr when traversing cast sub-expressions ...

Full-expressions are Sema-generated implicit nodes that cover
constant-expressions and expressions-with-cleanup for temporaries.

Ignore those as part of implicit-ignore, and also remove too-aggressive
IgnoreImplicit (which includes nested ImplicitCastExprs, for example)
on unpacked sub-expressions.

Add some unittests to demonstrate that RecursiveASTVisitor sees through
ConstantExpr nodes correctly.

Adjust cxx2a-consteval test to cover diagnostics for nested consteval
expressions that were previously missed.

Fixes bug #53044.

2022-03-21 15:05:53 -04:00

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