+
+(test-exception (expand-pattern-matches
+ '((data A [foo Int]
+ [bar Bool])
+ (let ([(foo x) (foo 0)]) x))))
+
+(test-prog '((data A [foo Int])
+ (let ([x (foo 42)])
+ (let ([(foo y) x])
+ (+ 2 y))))
+ 44)
+
+(test-prog '((data A [foo Bool Int Int])
+ (let ([x (foo (= 2 1) 123 45)]
+ [(foo a b c) x])
+ (+ b c)))
+ (+ 123 45))
+
+(test-prog '((data A [foo Int])
+ (data B [bar A])
+ (let ([(bar (foo x)) (bar (foo 42))])
+ x))
+ 42)
+
+(test-prog '((data Foo [a] [b] [c])
+ (let ([x b])
+ (case x
+ [a 3]
+ [b 2]
+ [c 1])))
+ 2)
+
+(test-prog '((data Foo [foo Int Int] [bar Bool])
+ (case (foo 42 12)
+ [(foo 20 x) 0]
+ [(foo 42 x) x]
+ [(foo y x) 0]
+ [(bar x) 0]))
+ 12)
+
+(test-prog '((data Foo [foo Int])
+ (data Bar [bar Foo])
+ (case (bar (foo 42))
+ [(bar (foo x)) x]))
+ 42)
+
+
+ ; mix of singleton and non singleton constructors
+(test-prog '((data A [foo Int] [bar])
+ (case (foo 42)
+ [(foo x) x]
+ [bar 0]))
+ 42)
+
+(test-prog '((data A [foo Int] [bar])
+ (case bar
+ [(foo x) 0]
+ [bar 12]))
+ 12)
+ ; todo: make this error for incomplete pattern match
+(test-exception
+ (codegen '((data A [foo Int] [bar Int B])
+ (data B [baz Int])
+ (let ([val (bar 42 (baz 12))])
+ (case val
+ [(foo 42) 0]
+ [(bar 32 (baz 12)) 1]
+ [(bar 42 (baz x)) x]
+ [(foo x) 2])))))
+