erg/doc/JA/compiler/TODO_warn.md

# warnings (未実装)

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* `t = {(record type)}` => `T = {(record type)}`? (only types defined as constants can be used for type specification)
* `{I: Int | ...}!` => `{I: Int! | ...}`
* `return x`(`x != ()`) in for/while block => `f::return` (outer block)?