fixes #2594

tests/metatype/tprocbothmeta.nim

@@ -1,5 +1,5 @@
 
-proc myFun[A,B](x: A): B =
+proc myFun[A](x: A): auto =
   result = float(x+10)
 
 proc myMap[T,S](sIn: seq[T], f: proc (q: T): S): seq[S] =

tests/metatype/tunresolved_return_type.nim

@@ -0,0 +1,20 @@
+discard """
+  errormsg: "cannot instantiate: 'T'"
+  line: 12
+"""
+
+# bug #2594
+
+
+type
+  ResultValue* = int64
+
+proc toNumber[T: int|uint|int64|uint64](v: ResultValue): T =
+  if v < low(T) or v > high(T):
+    raise newException(RangeError, "protocol error")
+  return T(v)
+
+#proc toNumber[T](v: int32): T =
+#  return (v)
+
+echo toNumber(23)