40 lines
1.3 KiB
Rust
40 lines
1.3 KiB
Rust
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// force-host
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// no-prefer-dynamic
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// Proc macro helper for issue #89699, used by tests/ui/proc-macro/edition-gated-async-move-
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// syntax-issue89699.rs, emitting an `async move` closure. This syntax is only available in
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// editions 2018 and up, but is used in edition 2015 in the test.
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#![crate_type = "proc-macro"]
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extern crate proc_macro;
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use proc_macro::*;
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#[proc_macro_attribute]
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pub fn foo(_attr: TokenStream, item: TokenStream) -> TokenStream {
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let tt = item.into_iter().next().unwrap();
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let sp = tt.span();
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let mut arg = TokenStream::new();
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let mut g = Group::new(Delimiter::Brace, TokenStream::new());
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g.set_span(sp);
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arg.extend([
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TokenTree::Ident(Ident::new("async", sp)),
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TokenTree::Ident(Ident::new("move", sp)),
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TokenTree::Group(g),
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]);
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let mut body = TokenStream::new();
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body.extend([
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TokenTree::Ident(Ident::new("async_main", sp)),
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TokenTree::Group(Group::new(Delimiter::Parenthesis, arg)),
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]);
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let mut ret = TokenStream::new();
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ret.extend([
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TokenTree::Ident(Ident::new("fn", sp)),
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TokenTree::Ident(Ident::new("main", sp)),
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TokenTree::Group(Group::new(Delimiter::Parenthesis, TokenStream::new())),
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TokenTree::Group(Group::new(Delimiter::Brace, body)),
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]);
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ret
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}
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