docs: Drop a now-stabilised feature declaration

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/src/lib.rs b/src/lib.rs
index 14363c9f08d147912f26e6325f2d5391b8450937..1a08f1d721fe2729d4fed0c1c6c20b50d872d073 100644 (file)
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -3,7 +3,6 @@
 // There is NO WARRANTY.
 
 #![feature(min_type_alias_impl_trait)]
-#![feature(io_into_inner_error_parts)]
 #![allow(clippy::redundant_closure_call)]
 
 pub mod imports;