Revert restrictict `exp.@var` to types in the same hierarchy#6484

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Aug 6, 2018

Commits on Aug 4, 2018

Revert "Restrict `exp.@var` to types in the same hierarchy (#6358)"

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Refactor: Char & IO related non UTF-8 encoding check
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Refactor: Crystal::Call#check_visibility and extract type methods
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