Parse: Reinterpret associativity kinds as contextual keywords

Author: AnthonyLatsis

lib/Parse/ParseDecl.cpp

@@ -6895,6 +6895,10 @@ Parser::parseDeclPrecedenceGroup(ParseDeclOptions flags,
         diagnose(Tok, diag::expected_precedencegroup_associativity);
         parsedAssociativity = Associativity::None;
         invalid = true;
+      } else {
+        // "left", "right" or "none" are considered contextual keywords.
+        TokReceiver->registerTokenKindChange(Tok.getLoc(),
+                                             tok::contextual_keyword);
       }
       associativity = *parsedAssociativity;
       associativityValueLoc = consumeToken();

test/IDE/coloring.swift

@@ -165,7 +165,7 @@ protocol Prot {
 infix operator *-* : FunnyPrecedence
 
 // CHECK: <kw>precedencegroup</kw> FunnyPrecedence
-// CHECK-NEXT: <kw>associativity</kw>: left{{$}}
+// CHECK-NEXT: <kw>associativity</kw>: <kw>left</kw>{{$}}
 // CHECK-NEXT: <kw>higherThan</kw>: MultiplicationPrecedence
 precedencegroup FunnyPrecedence {
   associativity: left