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[constexpr][c++2a] Try-catch blocks in constexpr functions
Implement support for try-catch blocks in constexpr functions, as proposed in http://wg21.link/P1002 and voted in San Diego for c++20. The idea is that we can still never throw inside constexpr, so the catch block is never entered. A try-catch block like this: try { f(); } catch (...) { } is then morally equivalent to just { f(); } Same idea should apply for function/constructor try blocks. rdar://problem/45530773 Differential Revision: https://reviews.llvm.org/D55097 llvm-svn: 348789
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