RubyRegex match_m fails if run within a DummyDynamicScope
---------------------------------------------------------
Key: JRUBY-5072
URL: http://jira.codehaus.org/browse/JRUBY-5072
Project: JRuby
Issue Type: Bug
Components: Core Classes/Modules, Extensions
Reporter: Tim Felgentreff
When running C extensions, we will not always have a proper scope available
when calling up into Ruby. The Json gem's tests currently fail trying to match
a string with the following error:
{quote}
Java::JavaLang::ClassCastException: org.jruby.RubyNil cannot be cast to
org.jruby.RubyMatchData
org.jruby.RubyRegexp.match_m(RubyRegexp.java:1330)
org.jruby.RubyRegexp$i_method_1_0$RUBYINVOKER$match_m.call(org/jruby/RubyRegexp$i_method_1_0$RUBYINVOKER$match_m.gen:65535)
org.jruby.RubyClass.finvoke(RubyClass.java:682)
org.jruby.javasupport.util.RuntimeHelpers.invoke(RuntimeHelpers.java:457)
org.jruby.cext.JRuby.callRubyMethod1(JRuby.java:77)
{quote}
This is because the Backref is retrieved from the DummyScope, which was
supposed to hold the match data (as set in the search method),however,dummy
scopes do not save backrefs and just return RubyNil, it seems.
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