string type check based on #to_str to encourage duck typing; #1616

4d92d2e1 · Yukihiro "Matz" Matsumoto · d957a678 · 4d92d2e1
Commit 4d92d2e1 authored Dec 24, 2013 by Yukihiro "Matz" Matsumoto
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mrblib/string.rb mrblib/string.rb +1 -1

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--- a/mrblib/string.rb
+++ b/mrblib/string.rb
@@ -137,7 +137,7 @@ class String
  ##
  # ISO 15.2.10.5.5
  def =~(re)
-    if re.is_a? String
+    if re.respond_to? :to_str
      raise TypeError, "type mismatch: String given"
    end
    re =~ self