Test cases

- Added `simple_pointer_cast.t` to test casting (currently broken parsing-wise)

DGen

- Added a todo for semantic tests for the `simple_pointer_cast.t` test case

source/tlang/compiler/codegen/emit/dgen.d

@@ -818,6 +818,7 @@ int main()
     return 0;
 }`);
         }
+        // TODO: Add semantic test for simple_pointer_cast.t
         else if(cmp(typeChecker.getModule().getName(), "simple_extern") == 0)
         {
             file.writeln(`

source/tlang/testing/simple_pointer_cast.t

@@ -0,0 +1,23 @@
+module simple_pointer_cast;
+
+int j;
+
+int ret()
+{
+    return 0;
+}
+
+int function(int* ptr)
+{
+    *(cast(int*)ret())=2;
+    *(ptr+ret()) = 2+2;
+    return (*ptr)+1*2;
+}
+
+int thing()
+{
+    int discardExpr = function(&j);
+    int** l;
+
+    return discardExpr;
+}