Fixed #3756 (False positive: uninitvar in malloc)

lib/tokenize.cpp

@@ -3013,6 +3013,10 @@ void Tokenizer::setVarId()
         }
 
         if (tok->isName()) {
+            // don't set variable id after a struct|enum|union
+            if (Token::Match(tok->previous(), "struct|enum|union"))
+                continue;
+
             if (!isC()) {
                 if (tok->previous() && tok->previous()->str() == "::")
                     continue;

test/testtokenize.cpp

@@ -209,6 +209,7 @@ private:
         TEST_CASE(varid43);
         TEST_CASE(varid44);
         TEST_CASE(varid45); // #3466
+        TEST_CASE(varid46); // struct varname
         TEST_CASE(varid_cpp_keywords_in_c_code);
         TEST_CASE(varidFunctionCall1);
         TEST_CASE(varidFunctionCall2);
@@ -3207,6 +3208,13 @@ private:
                       tokenizeDebugListing(code));
     }
 
+    void varid46() { // #3756
+        const std::string code("void foo() { int t; x = (struct t *)malloc(); f(t); }");
+        ASSERT_EQUALS("\n\n##file 0\n"
+                      "1: void foo ( ) { int t@1 ; x = ( struct t * ) malloc ( ) ; f ( t@1 ) ; }\n",
+                      tokenizeDebugListing(code, false, "test.c"));
+    }
+
     void varid_cpp_keywords_in_c_code() {
         const char code[] = "void f() {\n"
                             "    delete d;\n"