Rust suggests implementing private trait

[daboross]

With the following code:

struct Foo;

fn main() {
    Foo::new();
}

(playpen: http://is.gd/H05mfZ)

Rust tries to help with:

<anon>:4:5: 4:13 help: methods from traits can only be called if the trait is implemented and in scope; the following trait defines a method `new`, perhaps you need to implement it:
<anon>:4:5: 4:13 help: candidate #1: `std::sys_common::thread_info::NewThread`

This trait is impossible to implement however, as it is private - when implemented, rust will give a separate error about the trait being private. If this is the case, rust shouldn't suggest it at all.

Here's a playpen actually implementing the trait in question: http://is.gd/UQakvD

While this really isn't that much of a problem, as it is pretty obvious (to me) that I don't want to implement a NewThread trait, suggestions like this from the compiler may be confusing and discourage new users of the language.

[steveklabnik]

Update: no change.

[estebank]

error[E0599]: no function or associated item named `new` found for type `Foo` in the current scope
 --> src/main.rs:4:5
  |
1 | struct Foo;
  | ----------- function or associated item `new` not found for this
...
4 |     Foo::new();
  |     ^^^^^^^^ function or associated item not found in `Foo`