refactor!: replace pack! macros with derive-based pipeline types

Remove the `pack!`, `pack_err!`, `pack_structural!`, and
`pack_err_structural!` macros, replacing all pipeline type definitions
with `#[derive(Grouped)]` and `#[derive(Grouped, Wrap)]` attributes.
This changes the generated struct shape from named-field structs with an
`inner` field to tuple structs accessed via `.0`, and removes the
auto-generated `name` and `info` fields from error types.

1 files changed, 4 insertions, 2 deletions

diff --git a/examples/example-panic-unwind/src/main.rs b/examples/example-panic-unwind/src/main.rs
index 59adf07..f91b0f0 100644
--- a/examples/example-panic-unwind/src/main.rs
+++ b/examples/example-panic-unwind/src/main.rs
@@ -20,7 +20,9 @@ use mingling::{hook::ProgramHook, prelude::*};
 use std::io::Write;
 
 dispatcher!("panic", EntryPanic);
-pack!(NotPanic = ());
+
+#[derive(Grouped)]
+pub struct NotPanic;
 
 fn main() {
     let mut program = ThisProgram::new();
@@ -47,7 +49,7 @@ fn handle_panic(prev: EntryPanic) -> Next {
             // Panic happens here, will be caught
             panic!("{}", s)
         }
-        None => NotPanic::default().into(),
+        None => NotPanic.into(),
     }
 }