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4035: Convert bool to ident instead of literal in mbe r=matklad a=edwin0cheng Fixed #1249 Currently we treat boolean literal as `tt::Literal` , which makes parsing $lit:lit matcher easily. However, proc-macro2 treat boolean literal as `ident` : https://github.com/alexcrichton/proc-macro2/blob/4173a21dc497c67326095e438ff989cc63cd9279/src/lib.rs#L939 OT: I am quite happy we finally need to fix this bug :) Co-authored-by: Edwin Cheng <edwin0cheng@gmail.com>