I added an `edit-method` command to pry, which works in principle 
similarly to interactive_editor.

Except you can just go `edit-method obj.meth` and the source file for 
the method is opened and fast forwarded to the first line of the method. 
The file is re-loaded once the editor returns to the pry session too. 
Check out the docs on the `edit-method` command here if you're 
interested

http://rdoc.info/github/banister/pry/master/file/README.markdown

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