Getting "panic message is not a string literal" from Rust 2021

[applegrew]

When using Rust 2021 I am getting the following warning wherever parses_to! is used.

warning: panic message is not a string literal
  --> src/parser/unit_tests.rs:11:5
   |
11 | /     parses_to! {
12 | |         parser: JsParser,
13 | |         input: "10",
14 | |         rule: Rule::numeric_literal,
...  |
21 | |         ]
22 | |     };
   | |______^
   |
   = note: this is no longer accepted in Rust 2021
   = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

[applegrew]

I had to use #[allow(non_fmt_panic)] to turn off this warning.

[nirvdrum]

I'm using Rust 2018 and I'm seeing the warning as well. It started with Rust 1.51.0, I think.

[CAD97]

Yep, this is a new rustc warning that we didn't realize was a problem in the emitted code before.

[CAD97]

(I won't have the bandwidth to make a PR to fix this anytime soon, likely, but I can approve a PR if someone else sets it up. I believe @01mf02 found where the issue needs fixing.

[CAD97]

This should be fixed by #507.

[MarinPostma]

this fixed by #507

[nirvdrum]

If not too much of a problem, can we please get this in a release? I can continue to use #![allow(non_fmt_panic)], but this seems like the sort of thing that will be unexpected by new users.