Make sure @histfile is initialized before writing it. It could be uninitialized if entered via Debugger.start; debugger
Make sure @histfile is initialized before writing it. It could be uninitialized if entered via Debugger.start; debugger

git-svn-id: 88bbbf8f5798dc67c7e8670b837dd03176c2df4b@357 453b2852-3d18-0410-866e-d09c099698e4

gfowley/ruby-debug,ruby-debug/ruby-debug,gfowley/ruby-debug,ruby-debug/ruby-debug,gfowley/ruby-debug,ruby-debug/ruby-debug