Fix up AST printing for multiple types specified in operator decl.

Author: rudkx

include/swift/AST/Decl.h

@@ -6412,14 +6412,6 @@ class OperatorDecl : public Decl {
     return IdentifierLocs;
   }
 
-  Identifier getDesignatedNominalTypeName() const {
-    return !Identifiers.empty() ? Identifiers[0] : Identifier();
-  }
-
-  SourceLoc getDesignatedNominalTypeNameLoc() const {
-    return !IdentifierLocs.empty() ? IdentifierLocs[0] : SourceLoc();
-  }
-
   ArrayRef<NominalTypeDecl *> getDesignatedNominalTypes() const {
     return DesignatedNominalTypes;
   }

lib/AST/ASTPrinter.cpp

@@ -2876,8 +2876,14 @@ void PrintAST::visitInfixOperatorDecl(InfixOperatorDecl *decl) {
   if (auto *group = decl->getPrecedenceGroup())
     Printer << " : " << group->getName();
   auto designatedNominalTypes = decl->getDesignatedNominalTypes();
-  for (auto typeDecl : designatedNominalTypes)
-    Printer << ", " << typeDecl->getName();
+  auto first = true;
+  for (auto typeDecl : designatedNominalTypes) {
+    if (first && !decl->getPrecedenceGroup())
+      Printer << " : " << typeDecl->getName();
+    else
+      Printer << ", " << typeDecl->getName();
+    first = false;
+  }
 }
 
 void PrintAST::visitPrecedenceGroupDecl(PrecedenceGroupDecl *decl) {
@@ -2950,8 +2956,15 @@ void PrintAST::visitPrefixOperatorDecl(PrefixOperatorDecl *decl) {
     [&]{
       Printer.printName(decl->getName());
     });
-  if (!decl->getDesignatedNominalTypeName().empty())
-    Printer << " : " << decl->getDesignatedNominalTypeName();
+  auto designatedNominalTypes = decl->getDesignatedNominalTypes();
+  auto first = true;
+  for (auto typeDecl : designatedNominalTypes) {
+    if (first)
+      Printer << " : " << typeDecl->getName();
+    else
+      Printer << ", " << typeDecl->getName();
+    first = false;
+  }
 }
 
 void PrintAST::visitPostfixOperatorDecl(PostfixOperatorDecl *decl) {
@@ -2961,8 +2974,15 @@ void PrintAST::visitPostfixOperatorDecl(PostfixOperatorDecl *decl) {
     [&]{
       Printer.printName(decl->getName());
     });
-  if (!decl->getDesignatedNominalTypeName().empty())
-    Printer << " : " << decl->getDesignatedNominalTypeName();
+  auto designatedNominalTypes = decl->getDesignatedNominalTypes();
+  auto first = true;
+  for (auto typeDecl : designatedNominalTypes) {
+    if (first)
+      Printer << " : " << typeDecl->getName();
+    else
+      Printer << ", " << typeDecl->getName();
+    first = false;
+  }
 }
 
 void PrintAST::visitModuleDecl(ModuleDecl *decl) { }