Let-else not checking for curly brace of inline const before `else`

```rust
#![feature(inline_const)]

fn main() {
    let false = const {
        true
    } else {
        return;
    };
}
```

I believe the intention in let-else is that this code should be considered syntactically invalid, but it compiles successfully today.

If you replace `const` with `unsafe`, it correctly fails to parse.

```console
error: right curly brace `}` before `else` in a `let...else` statement not allowed
 --> src/main.rs:6:5
  |
6 |     } else {
  |     ^
  |
help: wrap the expression in parentheses
  |
4 ~     let false = (unsafe {
5 |         true
6 ~     }) else {
  |
```

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Let-else not checking for curly brace of inline const before `else` #118859

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Let-else not checking for curly brace of inline const before else #118859

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Let-else not checking for curly brace of inline const before `else` #118859