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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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3
lib/Sema/Constraint.cpp
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@@ -358,6 +358,9 @@ void Constraint::print(llvm::raw_ostream &Out, SourceManager *sm) const {
Out << "decl-via-unwrapped-optional ";
printDecl();
break;
case OverloadChoiceKind::DynamicMemberLookup:
Out << "dynamic member lookup '" << overload.getName() << "'";
break;
case OverloadChoiceKind::BaseType:
Out << "base type";
break;