Fixed #3231 (False positive: uninitialized variable '({...})')

lib/checkuninitvar.cpp

@@ -473,7 +473,10 @@ private:
         if (tok.varId()) {
             // array variable passed as function parameter..
             if (Token::Match(tok.previous(), "[(,] %var% [+-,)]")) {
-                use(checks, &tok);
+                if (Token::Match(tok.previous(), "( %var% ) ="))
+                    ExecutionPath::bailOutVar(checks, tok.varId());
+                else
+                    use(checks, &tok);
                 //use_array(checks, &tok);
                 return &tok;
             }

test/testuninitvar.cpp

@@ -973,6 +973,20 @@ private:
                        "    }\n"
                        "}\n");
         ASSERT_EQUALS("", errout.str());
+
+        // #3231 - ({ switch .. })
+        checkUninitVar("void f() {\n"
+                       "    int a;\n"
+                       "    ({\n"
+                       "    switch(sizeof(int)) {\n"
+                       "    case 4:\n"
+                       "    default:\n"
+                       "        (a)=0;\n"
+                       "        break;\n"
+                       "    };\n"
+                       "    })\n"
+                       "}");
+        ASSERT_EQUALS("", errout.str());
     }
 
     // arrays..