Add testcase for some old fixed issues (#14960)

* Add testcase for #2703

* Add testcase for #2586

* Small fix

tests/template/template_issues.nim

@@ -11,6 +11,8 @@ hey
 foo
 foo
 foo
+false
+true
 '''
 """
 
@@ -266,3 +268,9 @@ iterator hello() : int {.closure.} =
     
 foof(int)
 ggg(hello)
+
+
+# bug #2586
+var z = 10'u8
+echo z < 9 # Works
+echo z > 9 # Error: type mismatch

tissues.nim

@@ -16,3 +16,13 @@ f(nil)
 type A = object #of RootObj <-- Uncomment this to get no errors
   test: proc(i: A): bool
 var a: proc(i: A): bool # Or comment this line to get no errors
+
+
+# bug #2703
+type
+  fooObj[T] = object of RootObj
+  bazObj[T] = object of fooObj[T]
+    x: T
+
+var troz: fooObj[string]
+echo bazObj[string](troz).x