1 files changed, 4 insertions, 4 deletions
diff --git a/spec/practical/json_spec.cr b/spec/practical/json_spec.cr
index ed0fcfb..95795e2 100644
--- a/spec/practical/json_spec.cr
+++ b/spec/practical/json_spec.cr
@@ -20,12 +20,12 @@ struct JSONValue
 end
 
 def json_null
-  Parser.token_sequence("null".chars).map { |_| JSONValue.new(nil) }
+  Parser.token_sequence("null".chars).map_const(JSONValue.new(nil))
 end
 
 def json_bool
-  t = Parser.token_sequence("true".chars).map { |_| true }
-  f = Parser.token_sequence("false".chars).map { |_| false }
+  t = Parser.token_sequence("true".chars).map_const(true)
+  f = Parser.token_sequence("false".chars).map_const(false)
   (t | f).map { |b| JSONValue.new(b) }
 end
 
@@ -34,7 +34,7 @@ def json_number
   base_num = Parser(Char, Char).satisfy(&.ascii_number?).some.map do |cs|
     cs.join.to_i64
   end
-  sign = Parser.token('-').map { |_| -1 }.recover(1)
+  sign = Parser.token('-').map_const(-1).recover(1)
   (sign + base_num).map { |s, n| JSONValue.new(s.to_i64 * n) }
 end