Merge branch 'master' into peekable-stream

rust-lang · Jan 7, 2020 · 5dbab1a · 5dbab1a
2 parents 3e2a88b + f9e404f
commit 5dbab1a
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/futures-macro/src/lib.rs b/futures-macro/src/lib.rs
@@ -10,6 +10,9 @@
 
 #![doc(html_root_url = "https://docs.rs/futures-join-macro/0.3.0")]
 
+// Since https://github.com/rust-lang/cargo/pull/7700 `proc_macro` is part of the prelude for
+// proc-macro crates, but to support older compilers we still need this explicit `extern crate`.
+#[allow(unused_extern_crates)]
 extern crate proc_macro;
 
 use proc_macro::TokenStream;