| // 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)] |
| #![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), |
| ]) |
| })), |
| ]) |
| } |