Add testcase for some old fixed issues (#14960)

* Add testcase for #2703

* Add testcase for #2586

* Small fix

tests/ccgbugs/trecursive_closure.nim

@@ -1,18 +0,0 @@
-discard """
-action: compile
-"""
-
-# bug #2233
-type MalType = object
-  fun: proc: MalType
-
-proc f(x: proc: MalType) =
-  discard x()
-
-f(nil)
-
-# bug #2823
-
-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

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