Issue #14836 has been reported by tagomoris (Satoshi TAGOMORI).

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Feature #14836: Method to return first/last lineno/column of Proc
https://bugs.ruby-lang.org/issues/14836

* Author: tagomoris (Satoshi TAGOMORI)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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As written in https://bugs.ruby-lang.org/issues/6012, we want to know column no of Proc location.
In addition to it, I want to know the last_lineno and last_column.

If we don't have these values, we cannot know whether the "a" in code below is defined in block, or not.

```ruby
b1 = ->(){ foo() }; a = 1; b2 = ->(){ bar() }
```




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