Issue #10332 has been reported by Tsuyoshi Sawada.

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Feature #10332: Rational literal for mixed fractions
https://bugs.ruby-lang.org/issues/10332

* Author: Tsuyoshi Sawada
* Status: Open
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
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Current behavior of rational literal and `String#to_r` does not recognize mixed fractions. Mixed fraction is not rare, and is frequently used in places such as US length measurement.

![drill bits](http://www.strongtie.com/graphics/anchorsystems/catalog/tables/217b-2012.gif)

I propose that rational literal and `String#to_r` should be extended to handle mixed fractions. Perhaps something like:

~~~ruby
8 1/2r #=> (17/2)
"8 1/2".to_r #=> (17/2)
~~~

or


~~~ruby
(8 1/2)r #=> (17/2)
~~~




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