closes #4750

tests/template/tprocparshadow.nim

@@ -9,3 +9,22 @@ template something(name: untyped) =
 
 something(what)
 what(10)
+
+# bug #4750
+
+type
+  O = object
+    i: int
+
+  OP = ptr O
+
+template alf(p: pointer): untyped =
+  cast[OP](p)
+
+
+proc t1(al: pointer) =
+  var o = alf(al)
+
+proc t2(alf: pointer) =
+  var x = alf
+  var o = alf(x)