nobu	2018-04-24 21:25:46 +0900 (Tue, 24 Apr 2018)

  New Revision: 63252

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=63252

  Log:
    string.c: fix scanned substring with `\K`
    
    * string.c (scan_once): fix the matched substring with `\K`, the
      beginning of that string may differ from the matched position.
      [ruby-core:86663] [Bug #14707]

  Modified files:
    trunk/string.c
    trunk/test/ruby/test_string.rb
Index: test/ruby/test_string.rb
===================================================================
--- test/ruby/test_string.rb	(revision 63251)
+++ test/ruby/test_string.rb	(revision 63252)
@@ -1542,6 +1542,8 @@ CODE https://github.com/ruby/ruby/blob/trunk/test/ruby/test_string.rb#L1542
     assert_nil($~)
 
     assert_equal(3, S("hello hello hello").scan("hello".taint).count(&:tainted?))
+
+    assert_equal(%w[1 2 3], S("a1 a2 a3").scan(/a\K./))
   end
 
   def test_size
Index: string.c
===================================================================
--- string.c	(revision 63251)
+++ string.c	(revision 63252)
@@ -9046,6 +9046,7 @@ scan_once(VALUE str, VALUE pat, long *st https://github.com/ruby/ruby/blob/trunk/string.c#L9046
 	else {
 	    match = rb_backref_get();
 	    regs = RMATCH_REGS(match);
+	    pos = BEG(0);
 	    end = END(0);
 	}
 	if (pos == end) {

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