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swift-mirror/lib/SILGen/SILGenPoly.cpp
Michael Gottesman 179251d167 [sil-combine] Do not perform existential type propagation on @in parameters when we have a copy of the underlying value. 
Otherwise, we may get use-after-frees as in the added test.

rdar://50609145
2019-05-09 23:01:43 -07:00

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