Fix std_detect_file_io

2022-01-24 01:32:45 +00:00
parent f5c59b3514
commit efad3ead52
1 changed files with 5 additions and 0 deletions
--- a/library/stdarch/crates/std_detect/src/lib.rs
+++ b/library/stdarch/crates/std_detect/src/lib.rs
@@ -24,6 +24,11 @@
 #[macro_use]
 extern crate std;

+// rust-lang/rust#83888: removing `extern crate` gives an error that `vec_spare>
+#[cfg_attr(feature = "std_detect_file_io", allow(unused_extern_crates))]
+#[cfg(feature = "std_detect_file_io")]
+extern crate alloc;
+
 #[doc(hidden)]
 #[unstable(feature = "stdsimd", issue = "27731")]
 pub mod detect;