bindable_block 0.0.7
instance_exec can't pass block arguments through. Use a bindable block instead (there is also an optional core extension instance_exec_b, which will mimic the instance_exec interface, but also allow you to pass the block).
Gemfile:
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インストール:
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Development依存関係 (1):
rspec
>= 3.0.0, ~> 3.0