Raise exception from Range#first with beginless ranges.

2026-06-08 16:11:16 +00:00 · 2020-10-16 18:30:52 +09:00
parent d35677f213
commit cb636215bb
1 changed files with 1 additions and 0 deletions
@@ -11,6 +11,7 @@ class Range
  #   (10..20).first(3)  #=> [10, 11, 12]
  #
  def first(*args)
+    raise RangeError, "cannot get the first element of beginless range" if self.begin.nil?
    return self.begin if args.empty?

    raise ArgumentError, "wrong number of arguments (given #{args.length}, expected 1)" unless args.length == 1