28 lines
830 B
Rust
28 lines
830 B
Rust
//@ force-host
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//@ no-prefer-dynamic
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#![feature(proc_macro_quote)]
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#![crate_type = "proc-macro"]
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extern crate proc_macro as proc_macro_renamed; // This does not break `quote!`
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use proc_macro_renamed::{TokenStream, quote};
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#[proc_macro]
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pub fn hello(input: TokenStream) -> TokenStream {
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quote!(hello_helper!($input))
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//^ `hello_helper!` always resolves to the following proc macro,
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//| no matter where `hello!` is used.
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}
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#[proc_macro]
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pub fn hello_helper(input: TokenStream) -> TokenStream {
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quote! {
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extern crate hygiene_example; // This is never a conflict error
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let string = format!("hello {}", $input);
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//^ `format!` always resolves to the prelude macro,
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//| even if a different `format!` is in scope where `hello!` is used.
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hygiene_example::print(&string)
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}
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}
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