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Implement SE-0195, which introduces "Dynamic Member Lookup" Types (#14546)

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* Implement the recently accepted SE-0195 proposal, which introduces "Dynamic
Member Lookup" Types.  This is a dusted off and updated version of PR13361,
which switches from DynamicMemberLookupProtocol to @dynamicMemberLookup as
was requested by the final review decision.  This also rebases it,
updates it for other changes in the compiler, fixes a bunch of bugs, and adds support for keypaths.  

Thank you to @rudx and @DougGregor in particular for the helpful review comments and test cases!
This commit is contained in:
Chris Lattner
2018-02-16 16:19:50 -08:00
committed by GitHub
parent 3184dd8ad4
commit a0fa5d11b4
17 changed files with 845 additions and 71 deletions
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2
lib/Sema/CSRanking.cpp
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@@ -147,6 +147,7 @@ static bool sameOverloadChoice(const OverloadChoice &x,
case OverloadChoiceKind::DeclViaDynamic:
case OverloadChoiceKind::DeclViaBridge:
case OverloadChoiceKind::DeclViaUnwrappedOptional:
case OverloadChoiceKind::DynamicMemberLookup:
return sameDecl(x.getDecl(), y.getDecl());
case OverloadChoiceKind::TupleIndex:
@@ -855,6 +856,7 @@ SolutionCompareResult ConstraintSystem::compareSolutions(
case OverloadChoiceKind::Decl:
case OverloadChoiceKind::DeclViaBridge:
case OverloadChoiceKind::DeclViaUnwrappedOptional:
case OverloadChoiceKind::DynamicMemberLookup:
break;
}