I'm working on a proxy contract that will perform calls as follows:

bool success;
bytes memory returndata;
(success, returndata) = _to.call.value(_value)(_data);

this works great, except that, if the call reverts with an error message, this function will simply reverts, hiding the reason string.

How can I retrieve the reason string (I assume in the returndata) and use if to revert properly

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It is simpler than you think:

require(success, string (returndata));

See documentation for details. You may also forward raw bytes, but you will need to use assembly.

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  • I tryed require(success, returndata); and started looking into assembly when it failled to compile ... thanks for proving how stupid I am :P – Amxx Apr 1 '19 at 14:52

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