instance method LocalJumpError#reason

例外を発生させた原因をシンボルで返します。

返す値は以下のいずれかです。

• :break
• :redo
• :retry
• :next
• :return

例:

def foo
  proc { return 10 }
end

begin
  foo.call
rescue LocalJumpError => err
  p err              # => #<LocalJumpError: return from block-closure>
  p err.reason       # => :return
  p err.exit_value   # => 10
end

begin
  Block.new { break 5 }.call
rescue LocalJumpError => err
  p err              # => #<LocalJumpError: break from block-closure>
  p err.reason       # => :break
  p err.exit_value   # => 5
end