4a31cc859b
Add explanatory note to 'expected item' error Fixes #113110 It changes the diagnostic from this: ``` error: expected item, found `5` --> ../test.rs:1:1 | 1 | 5 | ^ expected item ``` to this: ``` error: expected item, found `5` --> ../test.rs:1:1 | 1 | 5 | ^ expected item | = note: items are things that can appear at the root of a module = note: for a full list see https://doc.rust-lang.org/reference/items.html ```