Macro vespertide_migration 

vespertide_migration!() { /* proc-macro */ }

Zero-runtime migration entry point.

Irreducible proc-macro shell: the #[proc_macro] attribute requires the signature fn(TokenStream) -> TokenStream (NOT TokenStream2), so this wrapper can only convert types and dispatch to vespertide_migration_impl (which is fully unit-tested via proc_macro2::TokenStream in tests/mod.rs). Proc-macro entry fns cannot run in unit tests (they require the compiler’s proc-macro server), so this shell is excluded from coverage.