Lang Hames 580ca237db [Support] Add a checked flag to Expected<T>, require checks before access or ...

destruction.

This makes the Expected<T> class behave like Error, even when in success mode.
Expected<T> values must be checked to see whether they contain an error prior
to being dereferenced, assigned to, or destructed.

llvm-svn: 265446

2016-04-05 19:57:03 +00:00

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