diff --git a/src/libsyntax_ext/proc_macro_server.rs b/src/libsyntax_ext/proc_macro_server.rs index ea4a8afc0aa..ca960cbe41b 100644 --- a/src/libsyntax_ext/proc_macro_server.rs +++ b/src/libsyntax_ext/proc_macro_server.rs @@ -150,6 +150,8 @@ impl FromInternal<(TokenStream, &'_ ParseSess, &'_ mut Vec)> Question => op!('?'), SingleQuote => op!('\''), + Ident(ident, false) if ident.name == keywords::DollarCrate.name() => + tt!(Ident::dollar_crate()), Ident(ident, is_raw) => tt!(Ident::new(ident.name, is_raw)), Lifetime(ident) => { let ident = ident.without_first_quote(); @@ -359,6 +361,10 @@ impl Ident { } Ident { sym, is_raw, span } } + fn dollar_crate(span: Span) -> Ident { + // `$crate` is accepted as an ident only if it comes from the compiler. + Ident { sym: keywords::DollarCrate.name(), is_raw: false, span } + } } // FIXME(eddyb) `Literal` should not expose internal `Debug` impls. diff --git a/src/test/ui/proc-macro/auxiliary/dollar-crate.rs b/src/test/ui/proc-macro/auxiliary/dollar-crate.rs new file mode 100644 index 00000000000..b0727a33332 --- /dev/null +++ b/src/test/ui/proc-macro/auxiliary/dollar-crate.rs @@ -0,0 +1,12 @@ +// force-host +// no-prefer-dynamic + +#![crate_type = "proc-macro"] + +extern crate proc_macro; +use proc_macro::TokenStream; + +#[proc_macro] +pub fn normalize(input: TokenStream) -> TokenStream { + input.into_iter().collect() +} diff --git a/src/test/ui/proc-macro/dollar-crate.rs b/src/test/ui/proc-macro/dollar-crate.rs new file mode 100644 index 00000000000..b8b1ddd5d1c --- /dev/null +++ b/src/test/ui/proc-macro/dollar-crate.rs @@ -0,0 +1,16 @@ +// compile-pass +// aux-build:dollar-crate.rs + +extern crate dollar_crate; + +type S = u8; + +macro_rules! check { () => { + dollar_crate::normalize! { + type A = $crate::S; + } +}} + +check!(); + +fn main() {}