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Suggest invalid expression when use public #100165

@TheAwiteb

Description

@TheAwiteb

When writing public let some = 3; it will suggest pub let some = 3; and I think nothing should be suggested before it is validated.

Note:
The statement to be suggested must be checked if it is true or not, if true it is suggested and if not it is not.

The issue from: #99903

Given the following code:

fn main() { public let some = 3; }

The current output is:

 Compiling playground v0.0.1 (/playground) error: expected one of `!`, `.`, `::`, `;`, `?`, `{`, `}`, or an operator, found keyword `let` --> src/main.rs:2:12 | 2 | public let some = 3; | ^^^ expected one of 8 possible tokens | help: write `pub` instead of `public` to make the item public | 2 | pub let some = 3; | ~~~ error: could not compile `playground` due to previous error 

Ideally the output should look like:

 Compiling playground v0.0.1 (/playground) error: expected one of `!`, `.`, `::`, `;`, `?`, `{`, `}`, or an operator, found keyword `let` --> src/main.rs:2:12 | 2 | public let some = 3; | ^^^ expected one of 8 possible tokens error: could not compile `playground` due to previous error 

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A-diagnosticsArea: Messages for errors, warnings, and lintsT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.

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