Given the following code:

function foo() {}

The current output is:

error: expected one of `!`, `.`, `::`, `;`, `?`, `{`, `}`, or an operator, found `foo` --> src/main.rs:2:11 | 2 | function foo() {} | ^^^ expected one of 8 possible tokens 

Ideally the output should look like: help: you likely meant to define a function using the `fn` keyword instead

Rustc already does this to an extent, for eg. here

pub function foo() {}

error: visibility `pub` is not followed by an item --> src/main.rs:2:1 | 2 | pub function foo() {} | ^^^ the visibility | = help: you likely meant to define an item, e.g., `pub fn foo() {}`

However, using a similar implementation to #99903, this could become ideal.

@rustbot claim