C99 scoping rules by default

test/libsolidity/syntaxTests/parsing/conditional_with_assignment.sol

@@ -1,11 +1,8 @@
 contract A {
-    function f() {
+    function f() public pure {
         uint y = 1;
-        uint x = 3 < 0 ? x = 3 : 6;
+        uint x = 3 < 0 ? y = 3 : 6;
         true ? x = 3 : 4;
     }
 }
 // ----
-// Warning: (17-119): No visibility specified. Defaulting to "public". 
-// Warning: (40-46): Unused local variable.
-// Warning: (17-119): Function state mutability can be restricted to pure