Support v0.8.4 custom errors

See the announcement article for the new custom error syntax.

For the following code:

/// Too big value for ceiling.
/// @param x Passed input.
error Ud60x18CeilOverflow(uint256 x);

I get this error in VSCode:

Linter: Parse error: missing ‘constant’ at ‘Ud60x18CeilOverflow’ [undefined]

[paulrberg]

Oh, but I knew that in the command-line the linting works. Sorry, I should have made that clear. In the terminal it works since v3.3.5.

I opened an issue in the vscode-solidity repo, the issue must be there. Thanks for your help, Franco!

[fvictorio]

Ohh, sorry, I totally missed the “VSCode” part in the original issue 😅 Thanks for letting me know!