Merge pull request #59 from zachs18/fix-unstable

Fix `unstable` feature.

Author: nicoburns

.github/workflows/rust.yml

@@ -24,6 +24,8 @@ jobs:
         run: MIRIFLAGS=-Zmiri-strict-provenance cargo miri test
       - name: Test (gecko-ffi) with Miri
         run: MIRIFLAGS=-Zmiri-strict-provenance cargo miri test --features=gecko-ffi
+      - name: Test (unstable features) with Miri
+        run: MIRIFLAGS=-Zmiri-strict-provenance cargo miri test --features=unstable
 
   build:
     runs-on: ubuntu-latest

src/lib.rs

@@ -142,6 +142,7 @@
 //! [pinned]: https://doc.rust-lang.org/std/pin/index.html
 
 #![cfg_attr(not(feature = "std"), no_std)]
+#![cfg_attr(feature = "unstable", feature(trusted_len))]
 #![allow(clippy::comparison_chain, clippy::missing_safety_doc)]
 
 extern crate alloc;
@@ -2052,7 +2053,6 @@ impl<T: Clone> From<&[T]> for ThinVec<T> {
     }
 }
 
-#[cfg(not(no_global_oom_handling))]
 impl<T: Clone> From<&mut [T]> for ThinVec<T> {
     /// Allocate a `ThinVec<T>` and fill it by cloning `s`'s items.
     ///