E0308 shows an incorrect suggestion if include_bytes! is used where &str is expected

[ghost]

fn main() {
    let _: &str = include_bytes!("/etc/passwd");
}

playground link

error[E0308]: mismatched types
 --> bug.rs:2:19
  |
2 |     let _: &str = include_bytes!("bug.rs");
  |                   ^^^^^^^^^^^^^^^^^^^^^^^^
  |                   |
  |                   expected str, found array of 58 elements
  |                   help: consider removing the leading `b`: `nclude_bytes!("bug.rs")`
  |
  = note: expected type `&str`
             found type `&'static [u8; 58]`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0308`.

The compiler (correctly) complains about a type mismatch, but suggests something that isn't applicable, as there is no literal to remove the b from.

Suggestion: define a special case for the include_bytes! and include_str! macros. The compiler should suggest replacing the former with the latter.

Meta

Rustc version:

rustc 1.28.0-nightly (4a9c58c6b 2018-06-05)
binary: rustc
commit-hash: 4a9c58c6bd0e609538053a35685e206f66019820
commit-date: 2018-06-05
host: x86_64-unknown-linux-gnu
release: 1.28.0-nightly
LLVM version: 6.0

[kennytm]

Duplicate of #48364.