hint for global use of let instead of const or static

[hkBst]

Given the following code: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=ffbf1151b3ceaee128b58616565c8774

let global_variable = 0;

The current output is:

error: expected item, found keyword `let`
 --> src/lib.rs:1:1
  |
1 | let global_variable = 0;
  | ^^^ expected item

Ideally the output should look like:

Something about Rust not supporting this syntax and to try to use either static or const instead.

Since this is the syntax for writing local variables, I often try to use this same syntax at global scope and get an unhelpful error message.

[hkBst]

Proof that I am not alone in this: https://users.rust-lang.org/t/a-friendly-challenge-for-rust/23197/12

[kornelski]

Another case: https://users.rust-lang.org/t/module-to-encapsulate-a-communication/68382/3

[hkBst]

It seems this got fixed. Current message is:

error: expected item, found keyword `let`
 --> src/lib.rs:1:1
  |
1 | let global_variable = 0;
  | ^^^ consider using `const` or `static` instead of `let` for global variables