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40ae82f539
Currently, a keyword like `type` fails compilation as (a path segment of) a field name, for no clear reason. Trying to use `r#type` instead leads to the `r#` being part of the field name, which is unhelpful¹.
Don't require the field path to match a `macro_rules!` `expr`, use repeated `tt` instead. I can't tell why this was ever required: The internal stringify macro was introduced in 55091c92ed (diff-315c02cd05738da173861537577d159833f70f79cfda8cd7cf1a0d7a28ace31b) with an `expr` matcher without any explanation, and no tests are failing from making it match upstream's `stringify!` input format.
Special thanks to whoever implemented the unstable `macro-backtrace` feature in rustc, otherwise this would have been nigh impossible to track down!
¹ this can likely be fixed too by some sort of "unraw" macro that turns `r#foo` into `foo`, but that's a separate change not made in this PR