diagnostics should prefer naming items through the extern prelude instead of doc-hidden type aliases

[lolbinarycat]

Code

#![crate_type = "proc-macro"]

// note: `quote` is in Cargo.toml
use proc_macro::TokenStream;
use syn::Lit;

#[proc_macro]
pub fn macro1(input: TokenStream) -> TokenStream {
    let x = syn::parse_macro_input!(input as Lit);
    x.into_token_stream()
}

Current output

error[E0599]: no method named `into_token_stream` found for enum `syn::Lit` in the current scope
  --> src/lib.rs:10:7
   |
10 |     x.into_token_stream()
   |       ^^^^^^^^^^^^^^^^^
   |
   = help: items from traits can only be used if the trait is in scope
help: trait `ToTokens` which provides `into_token_stream` is implemented but not in scope; perhaps you want to import it
   |
3  + use syn::__private::ToTokens;
   |
help: there is a method `to_token_stream` with a similar name
   |
10 |     x.to_token_stream()
   |       ~~~~~~~~~~~~~~~

For more information about this error, try `rustc --explain E0599`.

Desired output

error[E0599]: no method named `into_token_stream` found for enum `syn::Lit` in the current scope
  --> src/lib.rs:10:7
   |
10 |     x.into_token_stream()
   |       ^^^^^^^^^^^^^^^^^
   |
   = help: items from traits can only be used if the trait is in scope
help: trait `ToTokens` which provides `into_token_stream` is implemented but not in scope; perhaps you want to import it
   |
3  + use ::quote::ToTokens;
   |
help: there is a method `to_token_stream` with a similar name
   |
10 |     x.to_token_stream()
   |       ~~~~~~~~~~~~~~~

For more information about this error, try `rustc --explain E0599`.

Rationale and extra context

diagnostics should avoid referencing #[doc(hidden)] items if at all possible. ideally it would suggest adding quote to the extern prelude if it wasn't there already, but that is tricky when rustc doesn't know anything about how dependencies are managed.

Other cases

No response

Rust Version

rustc 1.80.0-nightly (debd22da6 2024-05-29)
binary: rustc
commit-hash: debd22da66cfa97c74040ebf68e420672ac8560e
commit-date: 2024-05-29
host: x86_64-unknown-linux-gnu
release: 1.80.0-nightly
LLVM version: 18.1.6

Anything else?

No response

[lolbinarycat]

Another case of this is reccomending items through crate:: instead of through the extern prelude.

#![no_std]

extern crate alloc;

use alloc::vec::Vec;

mod foo {
    fn f() {
        let _ = Vec::new();
    }
}

error[E0433]: failed to resolve: use of undeclared type `Vec`
 --> src/lib.rs:9:17
  |
9 |         let _ = Vec::new();
  |                 ^^^ use of undeclared type `Vec`
  |
help: consider importing one of these structs
  |
8 +     use crate::Vec;
  |
8 +     use alloc::vec::Vec;
  |
8 +     use allocator_api2::vec::Vec;
  |
8 +     use heapless::Vec;
  |
    and 1 other candidate

[Kohei316]

@rustbot claim