cargo build - error[E0658] - proc_macro::Literal::byte_character(byte) about avr-hal

[Rahix]

The avr-hal-template is updated to pin the dependency version. New projects generated from the template will no longer run into this problem. Unclear whether this is enough or whether we should do more...

avr-hal itself also needs fixing for the examples.

For documentation, the dependency can be pinned using these lines in Cargo.toml:

# The latest releases of `proc-macro2` do not support the rust toolchain that
# we use.  Thus, we must fix this dependency to an older version where our
# toolchain is still supported.  See https://github.com/Rahix/avr-hal/issues/537
[build-dependencies.proc-macro2]
version = "=1.0.79"

[Rahix]

So avr-device will need to deal with this for its own CI, too. So maybe the solution is to simply pin proc-macro2 in avr-device-macros so it will solve the problem for each and every downstream crate (See Rahix/avr-device#156).

What does everyone else think about this? Are there any problems with doing this?

[Rahix]

Examples in this repository now also have the dependency pin (#544).

[Rahix]

From #546: The CI of this project (avr-hal) does not fail on this... Needs to be investigated.