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Add support for reaching receive #722

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Add support for reaching receive #722

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ggrieco-tob
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This PR should a fix for #714, however, it still need some additional code to make sure fallback and receive are not called often, since 99% of the time, they are not useful and will waste time.

@@ -47,7 +47,10 @@ import Echidna.Types.Signature

-- | Fallback function is the null string
fallback :: SolSignature
fallback = ("",[])
fallback = ("*fallback*",[])
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fallback functions can have parameters (i.e calldata), the receive function on the other hand is executed only when calldata is empty, so I'm not sure if this will fix all cases.

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