Issue #11181 has been updated by Allen Morris.


Pull request up to date as of 2016-01-25


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Feature #11181: Add a line directive to Ruby
https://bugs.ruby-lang.org/issues/11181#change-56686

* Author: Allen Morris
* Status: Open
* Priority: Normal
* Assignee: Yukihiro Matsumoto
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Add a __line directive__ to Ruby

```
  #line {nn} ["filename"]
```

This is done by creating a array of filenames and using the upper bits of the line_number to determine the current filename.  The original filename is in position 0.

An extra node is added by the parser that informs the compiler of the filenames so the backtrace code can also use the correct file names.

The __\_\_LINE____ and __\_\_FILE____ _constants_ are updated and compile time warnings are also effected.

There is a pull request at https://github.com/ruby/ruby/pull/911

The patch does not have any affect on current programs unless a line matching '#\s*line \d+(\s+"(.*)")?\s*$' is found in the ruby source code. 


More tests need to be written before this change sould be applied.

Use case:

This is helpful for debugging any generated code but is particularlly helpful for literate programming using Noweb.



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