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Sema: Fix substitution of opaque types with generic base class constraints. #26395

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jckarter
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They weren't always mapped out of context before building the interface type for the opaque
type decl, and we failed to substitute the base class constraint when forming an opaque archetype
with specific substitutions. Fixes rdar://problem/53318811.

…aints.

They weren't always mapped out of context before building the interface type for the opaque
type decl, and we failed to substitute the base class constraint when forming an opaque archetype
with specific substitutions. Fixes rdar://problem/53318811.
@jckarter
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@swift-ci Please test

@jckarter jckarter merged commit f1850ba into swiftlang:master Jul 30, 2019
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