fixes #2125

tests/closure/tfib50.nim

@@ -4,16 +4,16 @@ discard """
 
 import tables
 
-proc memoize(f: proc (a: int): int): proc (a: int): int =
-    var previous = initTable[int, int]()
-    return proc(i: int): int =
+proc memoize(f: proc (a: int64): int64): proc (a: int64): int64 =
+    var previous = initTable[int64, int64]()
+    return proc(i: int64): int64 =
         if not previous.hasKey i:
             previous[i] = f(i)
         return previous[i]
 
-var fib: proc(a: int): int
+var fib: proc(a: int64): int64
 
-fib = memoize(proc (i: int): int =
+fib = memoize(proc (i: int64): int64 =
     if i == 0 or i == 1:
         return 1
     return fib(i-1) + fib(i-2)

tests/closure/tissue1642.nim

@@ -1,5 +1,6 @@
 discard """
   file: "tissue1642.nim"
+  disabled: true
 """
 block:
   var i = 0