Tokenizer::findGarbageCode: detect wrong struct declaration

lib/tokenize.cpp

@@ -10224,6 +10224,22 @@ void Tokenizer::findGarbageCode() const
         }
     }
 
+    // invalid struct declaration
+    for (const Token *tok = tokens(); tok; tok = tok->next()) {
+        if (Token::Match(tok, "struct|class|enum %name%| {") && (!tok->previous() || Token::Match(tok->previous(), "[;{}]"))) {
+            const Token *tok2 = tok->linkAt(tok->next()->isName() ? 2 : 1);
+            if (Token::Match(tok2, "} %op%")) {
+                tok2 = tok2->next();
+                if (!Token::Match(tok2, "*|&|&&"))
+                    syntaxError(tok2, "Unexpected token '" + tok2->str() + "'");
+                while (Token::Match(tok2, "*|&|&&"))
+                    tok2 = tok2->next();
+                if (!Token::Match(tok2, "%name%"))
+                    syntaxError(tok2, "Unexpected token '" + tok2->str() + "'");
+            }
+        }
+    }
+
     // Keywords in global scope
     static const std::unordered_set<std::string> nonGlobalKeywords{"break",
         "continue",

test/testgarbage.cpp

@@ -47,6 +47,7 @@ private:
         TEST_CASE(wrong_syntax4); // #3618
         TEST_CASE(wrong_syntax_if_macro);  // #2518 - if MACRO()
         TEST_CASE(wrong_syntax_class_x_y); // #3585 - class x y { };
+        TEST_CASE(wrong_syntax_anonymous_struct);
         TEST_CASE(syntax_case_default);
         TEST_CASE(garbageCode1);
         TEST_CASE(garbageCode2); // #4300
@@ -403,6 +404,11 @@ private:
         }
     }
 
+    void wrong_syntax_anonymous_struct() {
+        ASSERT_THROW(checkCode("struct { int x; } = {0};"), InternalError);
+        ASSERT_THROW(checkCode("struct { int x; } * = {0};"), InternalError);
+    }
+
     void syntax_case_default() {
         ASSERT_THROW(checkCode("void f() {switch (n) { case: z(); break;}}"), InternalError);
 

test/testmemleak.cpp

@@ -2173,7 +2173,7 @@ private:
               "    return ret;\n"
               "}");
         ASSERT_EQUALS("", errout.str());
-        
+
         check("char *x() {\n"
               "    return strcpy(malloc(10), \"abc\");\n"
               "}");