Badly worded note for non-constant array length

```rust
let len = 42;
let arr = [0; len];
```

rustc 1.0.0 - 1.11.0: `error: expected constant integer for repeat count, found variable`
rustc 1.12.0 - 1.15.0: `non-constant path in constant expression`
rustc 1.16.0 - present: `non-constant used with constant`

Can we have the first one back please?