fixes #8568 (#11303)

* fixes #8568

* fixes regression

tests/overload/tor_isnt_better.nim

@@ -0,0 +1,18 @@
+discard """
+  errormsg: "ambiguous call;"
+  line: 16
+"""
+
+# bug #8568
+
+type
+  D[T] = object
+  E[T] = object
+
+proc g(a: D|E): string = "foo D|E"
+proc g(a: D): string = "foo D"
+
+proc test() =
+  let x = g D[int]()
+
+test()

tests/overload/toverload_various.nim

@@ -176,6 +176,28 @@ block tstaticoverload:
   foo("constant" & " " & "folding")
   foo(staticString("static string"))
 
+# bug #8568 (2)
+
+proc goo(a: int): string = "int"
+proc goo(a: static[int]): string = "static int"
+proc goo(a: var int): string = "var int"
+proc goo[T: int](a: T): string = "T: int"
+#proc goo[T](a: T): string = "nur T"
+
+const tmp1 = 1
+let tmp2 = 1
+var tmp3 = 1
+
+doAssert goo(1) == "static int"
+doAssert goo(tmp1) == "static int"
+doAssert goo(tmp2) == "int"
+doAssert goo(tmp3) == "var int"
+
+doAssert goo[int](1) == "T: int"
+
+doAssert goo[int](tmp1) == "T: int"
+doAssert goo[int](tmp2) == "T: int"
+doAssert goo[int](tmp3) == "T: int"
 
 # bug #6076