Fix #11594 internalAstError with immediately instantiated enum (#4841)

Author: chrchr-github

lib/tokenize.cpp

@@ -8059,7 +8059,7 @@ void Tokenizer::simplifyStructDecl()
                     }
 
                     if (isEnum) {
-                        if (tok->next()->str() == "{") {
+                        if (tok->next()->str() == "{" && tok->next()->link() != tok->tokAt(2)) {
                             tok->next()->str("(");
                             tok->linkAt(1)->str(")");
                         }

test/testsimplifytokens.cpp

@@ -2584,9 +2584,16 @@ class TestSimplifyTokens : public TestFixture {
 
     void simplifyVarDeclInitLists()
     {
-        const char code[] = "std::vector<int> v{a * b, 1};";
-        const char exp[] = "std :: vector < int > v { a * b , 1 } ;";
-        ASSERT_EQUALS(exp, tok(code));
+        {
+            const char code[] = "std::vector<int> v{a * b, 1};";
+            const char exp[] = "std :: vector < int > v { a * b , 1 } ;";
+            ASSERT_EQUALS(exp, tok(code));
+        }
+        {
+            const char code[] = "enum E { E0 } e{};";
+            const char exp[] = "enum E { E0 } ; enum E e ; e = { } ;";
+            ASSERT_EQUALS(exp, tok(code));
+        }
     }
 };