Fixed tests for Nim < 2.0

Author: Anuken

tests/test_objects.nim

@@ -7,14 +7,15 @@ block:
   var v = s.fromJson(Entry1)
   doAssert v.color == ""
 
-block:
-  type Frog = object
-    legs: int = 4
+when NimMajor >= 2: # Default field values are only supported in Nim 2.0+
+  block:
+    type Frog = object
+      legs: int = 4
 
-  var s = "{}"
-  var f = s.fromJson(Frog)
-  # Make sure the default value is deserialized correctly.
-  doAssert f.legs == 4
+    var s = "{}"
+    var f = s.fromJson(Frog)
+    # Make sure the default value is deserialized correctly.
+    doAssert f.legs == 4
 
 block:
   type Foo2 = ref object