Fix no std with alloc (#226)

* Fix compile for no_std users

* Add regression test for no_std users with alloc on

Author: andrew-signal

.github/workflows/rust.yml

@@ -31,6 +31,10 @@ jobs:
       if: matrix.rust == '1.60.0'
       run: |
         cargo check --features=alloc,std,grab_spare_slice
+    - name: Check no_std with alloc
+      if: matrix.rust != '1.60.0'
+      run: |
+        cargo check --no-default-features --features=alloc,grab_spare_slice,latest_stable_rust
     - name: Test non nightly
       if: matrix.rust != '1.60.0' && matrix.rust != 'nightly'
       run: |

src/tinyvec.rs

@@ -707,7 +707,7 @@ impl<A: Array> TinyVec<A> {
     if len <= A::CAPACITY {
       TinyVec::Inline(ArrayVec::from_array_len(A::default(), len))
     } else {
-      TinyVec::Heap(vec![A::Item::default(); len])
+      TinyVec::Heap(alloc::vec![A::Item::default(); len])
     }
   }