These are not needed until NomicFoundation#600 lands, so let's simplify the
implementation for now.

There's no benefit in bigger flexibility as these functions should
always be called using the lexer directly, so pass it directly in the
recovery code.

This makes the resulting code a bit easier to format and read, as it
doesn't need to group the parameter in `{}` and is better
supported/breaks easier in Rustfmt.