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Add further tests for things defined in C2Y that correspond to how GCC already behaves. Some of these are for previous undefined behavior where what is violated has become a constraint but previously was a "shall" outside Constraints. Others (c2y-anon-init-1.c and c2y-incomplete-2.c) reflect semantics that were intended all along but not correctly or sufficiently clearly stated in the standard. Tested for x86_64-pc-linux-gnu. * gcc.dg/c2y-anon-init-1.c, gcc.dg/c2y-incomplete-2.c: gcc.dg/c2y-linkage-1.c, gcc.dg/c2y-linkage-2.c, gcc.dg/c2y-linkage-3.c, gcc.dg/c2y-linkage-4.c, gcc.dg/c2y-static-assert-1.c: New tests.
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