fix some racunit types, add test case

original commit: 0a2b16f804502b169e1b1a7ab89fe25f5f6bb0ed

collects/tests/typed-scheme/succeed/racunit.ss

@@ -0,0 +1,18 @@
+#lang typed/scheme
+
+(require typed/racunit)
+
+(: my-+ : Integer Integer -> Integer)
+(define (my-+ a b)
+  (if (zero? a)
+      b
+      (my-+ (sub1 a) (add1 b))))
+
+(: my-* : Integer Integer -> Integer)
+(define (my-* a b)
+  (if (zero? a)
+      b
+      (my-* (sub1 a) (my-+ b b))))
+
+(check-equal? (my-+ 1 1) 2 "Simple addition")
+(check-equal? (my-* 1 2) 2 "Simple multiplication")

collects/typed/racunit/main.rkt

@@ -2,12 +2,11 @@
 (require typed/private/utils)
 
 (define-type check-ish-ty
-  (All (A B)
-       (case-lambda
-         (A B -> #t)
-         (A B String -> #t))))
-(define-type (Predicate A) (A -> Boolean))
-(define-type (Thunk A) (-> A))
+  (case-lambda
+    (Any Any -> Void)
+    (Any Any String -> Void)))
+(define-type (Predicate A) (Any -> Boolean))
+(define-type (Thunk A) (-> Any))
 
 ; 3.2
 (require/typed/provide