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Solidity : Return value of transfer, transferFrom, or approve function of ERC-20 standard is always false.
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Solidity : Return value of transfer, transferFrom, or approve function of ERC-20 standard is always false.
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See also
Solidity : Using approve function of the ERC-20 token standard
Solidity : ERC-20 transfer should throw
Solidity : Prefer external to public visibility level
