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Human readable (concise) output #416

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@seanyoung

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@seanyoung

The solang compiler uses this crate for integer literals, which can 256 bits in Solidity.

However formatting bigints with Display is not great.

contract c {
     int256 constant a = 1e1000;
}

gives the diagnostic:

error: literal 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 is too large to fit into type 'int256'

It would be nice if we had a .to_human_readable() function which would either use e notation or what solc does:

Error: Type int_const 1000...(993 digits omitted)...0000 is not implicitly convertible to expected type int256. Literal is too large to fit in int256.

This would work for large numbers which don't consist of lots of zeros too.

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