StringIO#gets should set $_ to nil when it runs out of lines
------------------------------------------------------------
Key: JRUBY-2450
URL: http://jira.codehaus.org/browse/JRUBY-2450
Project: JRuby
Issue Type: Bug
Components: Extensions
Affects Versions: JRuby 1.1.1
Reporter: Charles Oliver Nutter
Assignee: Charles Oliver Nutter
Fix For: JRuby 1.1.2
Probably easy to fix, but we need to scan for other cases. This code does not
leave $_ nil in JRuby but does in MRI:
{noformat}
s = StringIO.new("foo\n", "r")
s.gets
s.gets
{noformat}
Because of this code in RubyStringIO:
{noformat}
@JRubyMethod(name = "gets", optional = 1)
public IRubyObject gets(ThreadContext context, IRubyObject[] args) {
checkReadable();
IRubyObject result = internalGets(args);
if (!result.isNil()) {
context.getCurrentFrame().setLastLine(result);
}
return result;
}
{noformat}
There may be others like this as well.
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