Function usage_error

aiscript-derived/src/lib.rs:24–26

(meta: &syn::meta::ParseNestedMeta, msg: &str)

}

fn usage_error(meta: &syn::meta::ParseNestedMeta, msg: &str) -> syn::parse::Error {
    meta.error(format_args!("{msg}. `#[collect(...)]` requires one mode (`require_static`, `no_drop`, or `unsafe_drop`) and optionally `bound = \"...\"`."))
}

// Deriving `Collect` must be done with care, because an implementation of `Drop` is not
// necessarily safe for `Collect` types. This derive macro has three available modes to ensure