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Commit | Line | Data |
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a1dfa0c6 | 1 | // force-host |
8faf50e0 XL |
2 | // no-prefer-dynamic |
3 | ||
4 | #![crate_type = "proc-macro"] | |
5 | ||
6 | extern crate proc_macro; | |
7 | use proc_macro::*; | |
8 | ||
9 | #[proc_macro] | |
10 | pub fn check(input: TokenStream) -> TokenStream { | |
11 | // Parsed `x2` can refer to `x2` from `input` | |
12 | let parsed1: TokenStream = "let x3 = x2;".parse().unwrap(); | |
13 | // `x3` parsed from one string can refer to `x3` parsed from another string. | |
14 | let parsed2: TokenStream = "let x4 = x3;".parse().unwrap(); | |
15 | // Manually assembled `x4` can refer to parsed `x4`. | |
16 | let manual: Vec<TokenTree> = vec![ | |
17 | Ident::new("let", Span::call_site()).into(), | |
18 | Ident::new("x5", Span::call_site()).into(), | |
19 | Punct::new('=', Spacing::Alone).into(), | |
20 | Ident::new("x4", Span::call_site()).into(), | |
21 | Punct::new(';', Spacing::Alone).into(), | |
22 | ]; | |
23 | input.into_iter().chain(parsed1.into_iter()) | |
24 | .chain(parsed2.into_iter()) | |
25 | .chain(manual.into_iter()) | |
26 | .collect() | |
27 | } |