parse.y (new_regexp): Fix SEGV of `/#{"\u3042"}#{'い'}/` in non UTF-8

Mixing other encoding string literals in one Regexp caused SEGV.
This bug was found by CoverityScan.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61862 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 6 insertions, 2 deletions

diff --git a/test/ruby/test_mixed_unicode_escapes.rb b/test/ruby/test_mixed_unicode_escapes.rb
index 09240d8ab2..f0b4cc691f 100644
--- a/test/ruby/test_mixed_unicode_escapes.rb
+++ b/test/ruby/test_mixed_unicode_escapes.rb
@@ -13,14 +13,18 @@ class TestMixedUnicodeEscape < Test::Unit::TestCase
     # 8-bit character escapes are okay.
     assert_equal("B\xFF", "\u0042\xFF")
 
-    # sjis mb chars mixed with Unicode shound not work
+    # sjis mb chars mixed with Unicode should not work
     assert_raise(SyntaxError) { eval %q("�\u1234")}
     assert_raise(SyntaxError) { eval %q("\u{1234}�")}
 
+    # also should not work for Regexp
+    assert_raise(SyntaxError) { eval %q(/#{"\u1234"}#{"�"}/)}
+    assert_raise(RegexpError) { eval %q(/\u{1234}#{nil}�/)}
+    assert_raise(RegexpError) { eval %q(/�#{nil}\u1234/)}
+
     # String interpolation turns into an expression and we get
     # a different kind of error, but we still can't mix these
     assert_raise(Encoding::CompatibilityError) { eval %q("\u{1234}#{nil}�")}
     assert_raise(Encoding::CompatibilityError) { eval %q("�#{nil}\u1234")}
-
   end
 end