Bump actions/checkout from 5 to 6

chore: release v1.0.4 (#95)

Support `cfg(true)` and `cfg(false)` (#99)

Set and test a MSRV of 1.32

Set `-Dwarnings` via CI env rather than `cfg`

Have a single top-level rule.

Document and test for a subtle case.

chore: release v1.0.3 (#93)

Revert "Remove `@__identity` rule."

chore: release v1.0.2 (#88)

Fix some ugly and inconsistent formatting.

Remove `@__identity` rule.

Bump actions/checkout from 4 to 5

chore: release v1.0.1

Remove `compiler-builtins` from `rustc-dep-of-std` dependencies