Rust can parse Very Long nine tails since 1.55.0

[nabijaczleweli]

False negative in the test, nbd

[keszybz]

I think should be conditionalized on rust version. With rust 1.54.0 this test now fails.

[nabijaczleweli]

Yeah, fair. cfg(version) is experimental, so I effectively inlined the rustc_version crate, and pick the old path before rustc 1.55

[keszybz]

I tested this with rust-1.54.0-1.fc33.x86_64 and cargo-1.56.1-1.fc33.x86_64 and the tests pass in both cases.