rust/tests/ui/proc-macro/auxiliary/proc-macro-panic.rs

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// force-host
// no-prefer-dynamic
#![crate_type = "proc-macro"]
extern crate proc_macro;
use proc_macro::{TokenStream, Ident, Span};
#[proc_macro]
pub fn panic_in_libproc_macro(_: TokenStream) -> TokenStream {
Ident::new("", Span::call_site());
TokenStream::new()
}