When using `Box<self>` in first method parameter, the error output provides the wrong type in help message

[sisungo]

Code

struct Foo {

}
impl Foo {
    fn invoke(Box<self>) -> i32 {
        0
    }
}

fn main() {}

Current output

error: expected one of `:`, `@`, or `|`, found `<`
 --> main.rs:5:18
  |
5 |     fn invoke(Box<self>) -> i32 {
  |                  ^ expected one of `:`, `@`, or `|`
  |
  = note: anonymous parameters are removed in the 2018 edition (see RFC 1685)
help: if this is a `self` type, give it a parameter name
  |
5 |     fn invoke(self: Box<self>) -> i32 {
  |               +++++
help: if this is a type, explicitly ignore the parameter name
  |
5 |     fn invoke(_: Box<self>) -> i32 {
  |               ++

error: aborting due to 1 previous error

Desired output

error: expected one of `:`, `@`, or `|`, found `<`
 --> main.rs:5:18
  |
5 |     fn invoke(Box<self>) -> i32 {
  |                  ^ expected one of `:`, `@`, or `|`
  |
  = note: anonymous parameters are removed in the 2018 edition (see RFC 1685)
help: if this is a `self` type, give it a parameter name
  |
5 |     fn invoke(self: Box<Self>) -> i32 {
  |               +++++
help: if this is a type, explicitly ignore the parameter name
  |
5 |     fn invoke(_: Box<Self>) -> i32 {
  |               ++

error: aborting due to 1 previous error

Rationale and extra context

The type of the parameter in the error message should be uppercase, Box<Self>. However, a lowercase Box<self> is present.

Other cases

No response

Rust Version

$ rustc --version --verbose
rustc 1.80.0-nightly (79734f1db 2024-05-02)
binary: rustc
commit-hash: 79734f1db8dbe322192dea32c0f6b80ab14c4c1d
commit-date: 2024-05-02
host: aarch64-apple-darwin
release: 1.80.0-nightly
LLVM version: 18.1.4

Anything else?

No response

[chenyukang]

if you apply the suggestion, the next error diagnostic is right:

error: attempt to use a non-constant value in a constant
 --> src/main.rs:5:25
  |
5 |     fn invoke(self: Box<self>) -> i32 {
  |                         ^^^^ help: try using `Self`

I'm not sure we should fix it.