added tests, actually implemented $ and ==

lib/system.nim

@@ -1532,7 +1532,7 @@ iterator fieldPairs*[S: tuple|object, T: tuple|object](x: S, y: T): tuple[
   ## The current implementation also has a bug that affects symbol binding
   ## in the loop body.
 
-proc `==`*[T: tuple](x, y: T): bool = 
+proc `==`*[T: tuple|object](x, y: T): bool = 
   ## generic ``==`` operator for tuples that is lifted from the components
   ## of `x` and `y`.
   for a, b in fields(x, y):
@@ -1557,7 +1557,7 @@ proc `<`*[T: tuple](x, y: T): bool =
     if c > 0: return false
   return false
 
-proc `$`*[T: tuple](x: T): string = 
+proc `$`*[T: tuple|object](x: T): string = 
   ## generic ``$`` operator for tuples that is lifted from the components
   ## of `x`. Example:
   ##

tests/run/tobject.nim

@@ -13,7 +13,8 @@ proc initObject(x: int): Obj =
 suite "object basic methods":
   test "it should convert an objcet to a string":
     var obj = makeObj(1)
-    discard $obj
+    # Should be "obj: (foo: 1)" or similar.
+    check($obj == "(foo: 1)")
   test "it should test equality based on fields":
     check(initObj(1) == initObj(1))
   test "it should test equality based on fields for refs too":