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replace proc_macro_hack with proc_macro
This allows nested macro executions (and therefore allows macros in other crates to abstract the gen macros).
add rust-toolchain with nightly toolchain
Otherwise,
cargo check --all-features
fails, because it attempts to enable the nightly feature and fails on stable.fix a few lints
Similarly,
cargo check --all-features
enablesfeature = "strict"
, which turns the warnings into hard errors. I'm not sure if they were present a year ago (and ignored), but they fail the build today with--all-features
.