Printing ParseError when using custom token types?

[m0rphism]

Hi,

I'm using peg on top of a lexer and wonder how I can report ParseErrors nicely to the user.

In particular, the token representations contained in the ExpectedSet seem to be strings like "[Tok(Colon)]".

Implementing custom Display and Debug traits for my Token-type does not seem to help.

Am I missing something or is this a limitation of peg?

Thanks for your time!

edit: Ahh, probably the idea is to use the expected-macro everywhere, as peg cannot deduce how to display arbitrary token patterns nicely.

[m0rphism]

I ended up with using a parameterized rule to wrap token parsing:

rule tok(t: Token<'a>) -> () = quiet!{[t2 if t2 == t] { () }} / expected!(t.to_str())

In other rules I can then parse tokens via e.g. tok(Colon) instead of [Colon].