breaking change: symbol lookups in generics follows spec more closely; fixes #2664

tests/generics/mclosed_sym.nim

@@ -0,0 +1,10 @@
+
+type R* = object
+
+type Data*[T] = object
+  d*: T
+
+proc same(r:R, d:int) = echo "TEST2"
+
+proc doIt*(d:Data, r:R) =
+  r.same(1)      # Expecting this to invoke the local `same()` method

tests/generics/tclosed_sym.nim

@@ -0,0 +1,11 @@
+discard """
+  output: "TEST2"
+"""
+
+# bug #2664
+
+import mclosed_sym
+
+proc same(r:R, d:int) = echo "TEST1"
+
+doIt(Data[int](d:123), R())