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### What it does
Checks for public types with a `pub fn new() -> Self` method and no
implementation of
[`Default`](https://doc.rust-lang.org/std/default/trait.Default.html).
### Why is this bad?
The user might expect to be able to use
[`Default`](https://doc.rust-lang.org/std/default/trait.Default.html) as the
type can be constructed without arguments.
### Example
```
pub struct Foo(Bar);
impl Foo {
pub fn new() -> Self {
Foo(Bar::new())
}
}
```
To fix the lint, add a `Default` implementation that delegates to `new`:
```
pub struct Foo(Bar);
impl Default for Foo {
fn default() -> Self {
Foo::new()
}
}
```
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