Fix #12729 internalError with _Static_assert in C code (regression) (#6403)

Author: chrchr-github

lib/tokenize.cpp

@@ -102,7 +102,7 @@ const Token * Tokenizer::isFunctionHead(const Token *tok, const std::string &end
         tok = tok->link();
     if (tok->str() != ")")
         return nullptr;
-    if (!tok->isCpp() && !Token::Match(tok->link()->previous(), "%name%|)"))
+    if (!tok->isCpp() && !Token::Match(tok->link()->previous(), "%name%|(|)"))
         return nullptr;
     if (Token::Match(tok, ") ;|{|[")) {
         tok = tok->next();

test/testvarid.cpp

@@ -1294,6 +1294,10 @@ class TestVarID : public TestFixture {
         const char code3[] = "extern void (*arr[10])(uint32_t some);\n";
         const char expected3[] = "1: extern void ( * arr@1 [ 10 ] ) ( uint32_t some@2 ) ;\n";
         ASSERT_EQUALS(expected3, tokenize(code3, true));
+
+        const char code4[] = "_Static_assert(sizeof((struct S){0}.i) == 4);\n"; // #12729
+        const char expected4[] = "1: _Static_assert ( sizeof ( ( struct S ) { 0 } . i ) == 4 ) ;\n";
+        ASSERT_EQUALS(expected4, tokenize(code4, false));
     }
 
     void varid71() {