[ruby/strscan] Don't add begin to length for new string slice

(https://github.com/ruby/strscan/pull/87)

Fixes https://github.com/ruby/strscan/pull/86

https://github.com/ruby/strscan/commit/c17b015c00

1 files changed, 8 insertions, 0 deletions

diff --git a/test/strscan/test_stringscanner.rb b/test/strscan/test_stringscanner.rb
index d15c1d8568..2a127a773a 100644
--- a/test/strscan/test_stringscanner.rb
+++ b/test/strscan/test_stringscanner.rb
@@ -841,4 +841,12 @@ class TestStringScannerFixedAnchor < Test::Unit::TestCase
     assert_equal 1, s.skip(/a/)
     assert_nil      s.skip(/^b/)
   end
+
+  # ruby/strscan#86
+  def test_scan_shared_string
+    s = "hellohello"[5..-1]
+    ss = StringScanner.new(s).scan(/hello/)
+
+    assert_equal "hello", ss
+  end
 end