Issue when parsing lident

[amiralies]

it looks in some sitatations when parsers try to parse an identifier ignores some illegal tokens.
examples:

let x as 'y = ()

(~???x) => x

[IwanKaramazow]

Thanks for the report.

It seems that we don't report errors and just skip tokens. Will look into this.

[amiralies]

I submitted a fix i'm not sure if it's correct fix feel free to close or guide toward correct fix

[IwanKaramazow]

Sorry for the delay, merged your PR, solid work!

Fixed in #448