// compile-flags: --emit=link // no-prefer-dynamic #![crate_type = "proc-macro"] extern crate proc_macro; use proc_macro::{Delimiter, Group, Ident, TokenStream, TokenTree}; #[proc_macro] pub fn unsafe_block(input: TokenStream) -> TokenStream { let span = input.into_iter().next().unwrap().span(); TokenStream::from_iter([TokenTree::Ident(Ident::new("unsafe", span)), { let mut group = Group::new(Delimiter::Brace, TokenStream::new()); group.set_span(span); TokenTree::Group(group) }]) }