Commits on May 2, 2024

1. Add diagnostic::on_unimplemented attribute on rust >=1.78 …

   * Add the following diagnostics to hopefully lead people in the right direction
     when seeing trait problems related to ctxs and derives
   
   error[E0277]: the trait bound `FieldF: deku::DekuReader<'_, _>` is not satisfied
     --> examples/example.rs:37:14
      |
   37 |     field_f: FieldF,
      |              ^^^^^^ the trait `deku::DekuReader<'_, _>` is not implemented for `FieldF`
      |
      = note: implement by adding #[derive(DekuRead)] to `FieldF`
      = note: make sure the `ctx` sent into the function matches `FieldF`'s `ctx`
      = help: the following other types implement trait `deku::DekuReader<'a, Ctx>`:
                <() as deku::DekuReader<'_, Ctx>>
                <(A, B) as deku::DekuReader<'a, Ctx>>
                <(A, B, C) as deku::DekuReader<'a, Ctx>>
                <(A, B, C, D) as deku::DekuReader<'a, Ctx>>
                <(A, B, C, D, E) as deku::DekuReader<'a, Ctx>>
                <(A, B, C, D, E, F) as deku::DekuReader<'a, Ctx>>
                <(A, B, C, D, E, F, G) as deku::DekuReader<'a, Ctx>>
                <(A, B, C, D, E, F, G, H) as deku::DekuReader<'a, Ctx>>
              and 152 others
   
   * Rust Release: https://blog.rust-lang.org/2024/05/02/Rust-1.78.0.html
   * Rust MR: rust-lang/rust#119888

   

   wcampbell0x2a committed May 2, 2024
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