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### What it does
Detects manual `std::default::Default` implementations that are identical to a derived implementation.
### Why is this bad?
It is less concise.
### Example
```
struct Foo {
bar: bool
}
impl Default for Foo {
fn default() -> Self {
Self {
bar: false
}
}
}
```
Use instead:
```
#[derive(Default)]
struct Foo {
bar: bool
}
```
### Known problems
Derive macros [sometimes use incorrect bounds](https://github.com/rust-lang/rust/issues/26925)
in generic types and the user defined `impl` may be more generalized or
specialized than what derive will produce. This lint can't detect the manual `impl`
has exactly equal bounds, and therefore this lint is disabled for types with
generic parameters.
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