// compile-flags: --emit=link // no-prefer-dynamic // ^ compiletest by default builds all aux files as dylibs, but we don't want that for proc-macro // crates. If we don't set this, compiletest will override the `crate_type` attribute below and // compile this as dylib. Removing this then causes the test to fail because a `dylib` crate can't // contain a proc-macro. #![feature(repr128)] #![allow(incomplete_features)] #![crate_type = "proc-macro"] extern crate proc_macro; use proc_macro::{Delimiter, Group, Ident, Span, TokenStream, TokenTree}; use std::iter::FromIterator; #[proc_macro] pub fn macro_test(input_stream: TokenStream) -> TokenStream { let first_token = input_stream.into_iter().next().unwrap(); let span = first_token.span(); TokenStream::from_iter(vec![ TokenTree::Ident(Ident::new("fn", Span::call_site())), TokenTree::Ident(Ident::new("code", Span::call_site())), TokenTree::Group(Group::new(Delimiter::Parenthesis, TokenStream::new())), TokenTree::Group(Group::new(Delimiter::Brace, { let mut clause = Group::new(Delimiter::Brace, TokenStream::new()); clause.set_span(span); TokenStream::from_iter(vec![ TokenTree::Ident(Ident::new("if", Span::call_site())), TokenTree::Ident(Ident::new("true", Span::call_site())), TokenTree::Group(clause.clone()), TokenTree::Ident(Ident::new("else", Span::call_site())), TokenTree::Group(clause), ]) })), ]) }