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Commit ce0e3f8a authored by Ted Kremenek's avatar Ted Kremenek
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Have attribute 'objc_precise_lifetime' suppress -Wunused.

Fixes <rdar://problem/15596883>

In ARC, __attribute__((objc_precise_lifetime)) guarantees that the
object stored in it will survive to the end of the variable's formal
lifetime.  It is therefore useful even if it completely unused.

llvm-svn: 198888
parent 7c1fcf8b
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