Fixup Extension Printing

Author: CodaFi

lib/AST/ASTPrinter.cpp

@@ -2107,11 +2107,17 @@ void PrintAST::printExtension(ExtensionDecl *decl) {
     recordDeclLoc(decl, [&]{
       // We cannot extend sugared types.
       Type extendedType = decl->getExtendedType();
-      if (!extendedType || !extendedType->getAnyNominal()) {
+      if (!extendedType) {
         // Fallback to TypeRepr.
         printTypeLoc(decl->getExtendedTypeRepr());
         return;
       }
+      if (!extendedType->getAnyNominal()) {
+        // Fallback to the type.  This usually means we're trying to print an
+        // UnboundGenericType.
+        printTypeLoc(TypeLoc::withoutLoc(extendedType));
+        return;
+      }
       printExtendedTypeName(extendedType, Printer, Options);
     });
     printInherited(decl);