The Solidity parsers are outdated. There's a maintained alternative that should be used

[Mouradif]

Describe the bug
Not a bug but the 2 available Solidity parsers are very outdated. They don't support custom error declarations like so

error MyCustomError(uint someArg);

Additional context
By looking at ConsenSys's parser's network searching for forks with more activity, I found this repository:

https://github.com/solidity-parser/parser

and it supports CustomErrorDefinition