Upgrade to Rust nightly-2021-09-17 (#448)

caizixian · web-flow · commit e0eeeb2f06ea · 2021-09-22T13:46:49.000+12:00
diff --git a/rust-toolchain b/rust-toolchain
@@ -1 +1 @@
-nightly-2021-08-10
+nightly-2021-09-17
diff --git a/src/lib.rs b/src/lib.rs
@@ -13,7 +13,8 @@
 #![feature(trait_alias)]
 #![feature(const_panic)]
 #![feature(step_trait)]
-#![feature(const_generics)]
+#![feature(adt_const_params)]
+#![feature(generic_const_exprs)]
 // TODO: We should fix missing docs for public items and turn this on (Issue #309).
 // #![deny(missing_docs)]
 
