Sema: Fix crash when defining an extension of a nested type with constrains #7356
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…traints If the nested type itself has generic constraints, we would hit an assertion in requirement inference. Refactor some code so that we can make the assertion more accurate. Fixes <rdar://problem/30353095>.
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If the nested type itself has generic constraints, we would
hit an assertion in requirement inference. Refactor some code
so that we can make the assertion more accurate.
Fixes rdar://problem/30353095.