Revert "test cases for the new features"

This reverts commit 66653e8f14.

tests/compile/tgenericdefaults.nim

@@ -1,29 +0,0 @@
-type 
-  TFoo[T, U, R = int] = object
-    x: T
-    y: U
-    z: R
-
-  TBar[T] = TFoo[T, array[4, T], T]
-
-var x1: TFoo[int, float]
-
-static:
-  assert type(x1.x) is int
-  assert type(x1.y) is float
-  assert type(x1.z) is int
-  
-var x2: TFoo[string, R = float, U = seq[int]]
-
-static:
-  assert type(x2.x) is string
-  assert type(x2.y) is seq[int]
-  assert type(x2.z) is float
-
-var x3: TBar[float]
-
-static:
-  assert type(x3.x) is float
-  assert type(x3.y) is array[4, float]
-  assert type(x3.z) is float
-