ae0216d557
Follow up https://github.com/rust-lang/rust/pull/96861. This PR uses the traits added to the Rust 2021 Edition prelude. > The `TryInto`, `TryFrom` and `FromIterator` traits are now part of the prelude. https://doc.rust-lang.org/edition-guide/rust-2021/prelude.html
39 lines
1.5 KiB
Rust
39 lines
1.5 KiB
Rust
// compile-flags: --emit=link
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// no-prefer-dynamic
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// ^ compiletest by default builds all aux files as dylibs, but we don't want that for proc-macro
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// crates. If we don't set this, compiletest will override the `crate_type` attribute below and
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// compile this as dylib. Removing this then causes the test to fail because a `dylib` crate can't
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// contain a proc-macro.
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#![feature(repr128)]
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#![allow(incomplete_features)]
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#![crate_type = "proc-macro"]
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extern crate proc_macro;
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use proc_macro::{Delimiter, Group, Ident, Span, TokenStream, TokenTree};
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#[proc_macro]
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pub fn macro_test(input_stream: TokenStream) -> TokenStream {
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let first_token = input_stream.into_iter().next().unwrap();
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let span = first_token.span();
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TokenStream::from_iter(vec![
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TokenTree::Ident(Ident::new("fn", Span::call_site())),
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TokenTree::Ident(Ident::new("code", Span::call_site())),
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TokenTree::Group(Group::new(Delimiter::Parenthesis, TokenStream::new())),
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TokenTree::Group(Group::new(Delimiter::Brace, {
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let mut clause = Group::new(Delimiter::Brace, TokenStream::new());
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clause.set_span(span);
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TokenStream::from_iter(vec![
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TokenTree::Ident(Ident::new("if", Span::call_site())),
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TokenTree::Ident(Ident::new("true", Span::call_site())),
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TokenTree::Group(clause.clone()),
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TokenTree::Ident(Ident::new("else", Span::call_site())),
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TokenTree::Group(clause),
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])
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})),
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])
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}
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