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Yukihiro "Matz" Matsumoto 7eaaee5405 Add a new gem: mruby-catch.

Implements `catch`/`throw` non-local jump inherited from Lisp.

`catch([tag]) {|tag| block }  -> obj`

Example:
```
  catch(:foo) { 123 }               # => 123
  catch(:foo) { throw(:foo, 456) }  # => 456
  catch(:foo) { throw(:foo) }       # => nil
```

2020-10-12 18:20:07 +09:00

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 MRuby::Gem::Specification.new('mruby-catch') do |spec|
   spec.license = 'MIT'
   spec.author  = 'mruby developers'
   spec.summary = 'Catch / Throw non-local Jump'
 end