Use parseDeclNameRef in a few more places

include/swift/Parse/Parser.h

@@ -1840,6 +1840,9 @@ public:
     return DeclNameOptions(flag1) | flag2;
   }
 
+  /// Parse a declaration name that results in a `DeclNameRef` in the syntax
+  /// tree.
+  /// 
   /// Without \c DeclNameFlag::AllowCompoundNames, parse an
   /// unqualified-decl-base-name.
   ///

lib/Parse/ParseDecl.cpp

@@ -10330,8 +10330,9 @@ Parser::parseDeclOperatorImpl(SourceLoc OperatorLoc, Identifier Name,
   // designated protocol. These both look like identifiers, so we
   // parse them both as identifiers here and sort it out in type
   // checking.
-  SourceLoc colonLoc, groupLoc;
-  Identifier groupName;
+  SourceLoc colonLoc;
+  DeclNameLoc groupLoc;
+  DeclNameRef groupName;
   if (Tok.is(tok::colon)) {
     colonLoc = consumeToken();
     if (Tok.is(tok::code_complete)) {
@@ -10344,9 +10345,9 @@ Parser::parseDeclOperatorImpl(SourceLoc OperatorLoc, Identifier Name,
       return makeParserCodeCompletionResult<OperatorDecl>();
     }
 
-    (void)parseIdentifier(groupName, groupLoc,
-                          diag::operator_decl_expected_precedencegroup,
-                          /*diagnoseDollarPrefix=*/false);
+    groupName = parseDeclNameRef(groupLoc,
+                                 diag::operator_decl_expected_precedencegroup,
+                                 {});
 
     if (Context.TypeCheckerOpts.EnableOperatorDesignatedTypes) {
       // Designated types have been removed; consume the list (mainly for source
@@ -10361,7 +10362,7 @@ Parser::parseDeclOperatorImpl(SourceLoc OperatorLoc, Identifier Name,
         // These have no precedence group, so we already parsed the first entry
         // in the designated types list. Retroactively include it in the range.
         typesStartLoc = colonLoc;
-        typesEndLoc = groupLoc;
+        typesEndLoc = groupLoc.getEndLoc();
       }
 
       while (Tok.isNot(tok::eof)) {
@@ -10380,7 +10381,7 @@ Parser::parseDeclOperatorImpl(SourceLoc OperatorLoc, Identifier Name,
     } else {
       if (isPrefix || isPostfix) {
         // If we have nothing after the colon, then just remove the colon.
-        auto endLoc = groupLoc.isValid() ? groupLoc : colonLoc;
+        auto endLoc = groupLoc.isValid() ? groupLoc.getEndLoc() : colonLoc;
         diagnose(colonLoc, diag::precedencegroup_not_infix)
             .fixItRemove({colonLoc, endLoc});
       }
@@ -10391,6 +10392,7 @@ Parser::parseDeclOperatorImpl(SourceLoc OperatorLoc, Identifier Name,
   }
 
   // Diagnose deprecated operator body syntax `operator + { ... }`.
+  SourceLoc lastGoodLoc = PreviousLoc;
   SourceLoc lBraceLoc;
   if (consumeIf(tok::l_brace, lBraceLoc)) {
     if (isInfix && !Tok.is(tok::r_brace)) {
@@ -10398,7 +10400,6 @@ Parser::parseDeclOperatorImpl(SourceLoc OperatorLoc, Identifier Name,
     } else {
       auto Diag = diagnose(lBraceLoc, diag::deprecated_operator_body);
       if (Tok.is(tok::r_brace)) {
-        SourceLoc lastGoodLoc = groupLoc.isValid() ? groupLoc : NameLoc;
         SourceLoc lastGoodLocEnd = Lexer::getLocForEndOfToken(SourceMgr,
                                                               lastGoodLoc);
         SourceLoc rBraceEnd = Lexer::getLocForEndOfToken(SourceMgr, Tok.getLoc());
@@ -10420,7 +10421,8 @@ Parser::parseDeclOperatorImpl(SourceLoc OperatorLoc, Identifier Name,
   else
     res = new (Context)
         InfixOperatorDecl(CurDeclContext, OperatorLoc, Name, NameLoc, colonLoc,
-                          groupName, groupLoc);
+                          groupName.getBaseIdentifier(),
+                          groupLoc.getBaseNameLoc());
 
   diagnoseOperatorFixityAttributes(*this, Attributes, res);
 
@@ -10639,14 +10641,16 @@ Parser::parseDeclPrecedenceGroup(ParseDeclOptions flags,
           return abortBody(/*hasCodeCompletion*/true);
         }
 
-        if (Tok.isNot(tok::identifier)) {
-          diagnose(Tok, diag::expected_precedencegroup_relation, attrName);
+        DeclNameLoc nameLoc;
+        auto name = parseDeclNameRef(nameLoc,
+                                     { diag::expected_precedencegroup_relation,
+                                       attrName },
+                                     {});
+        if (!name) {
           return abortBody();
         }
-        Identifier name;
-        SourceLoc nameLoc = consumeIdentifier(name,
-                                              /*diagnoseDollarPrefix=*/false);
-        relations.push_back({nameLoc, name, nullptr});
+        relations.push_back({nameLoc.getBaseNameLoc(), name.getBaseIdentifier(),
+                             nullptr});
 
         if (skipUnspacedCodeCompleteToken())
           return abortBody(/*hasCodeCompletion*/true);

test/Parse/operator_decl.swift

@@ -83,6 +83,9 @@ precedencegroup D {
 precedencegroup E {
   higherThan:
 } // expected-error {{expected name of related precedence group after 'higherThan'}}
+precedencegroup EE {
+  higherThan: E,
+} // expected-error {{expected name of related precedence group after 'higherThan'}}
 
 precedencegroup F {
   higherThan: A, B, C