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# Assists
## `add_derive`
Adds a new `#[derive()]` clause to a struct or enum.
```rust
// BEFORE
struct Point {
x: u32,
y: u32,<|>
}
// AFTER
#[derive()]
struct Point {
x: u32,
y: u32,
}
```
## `add_explicit_type`
Specify type for a let binding
```rust
// BEFORE
fn main() {
let x<|> = 92;
}
// AFTER
fn main() {
let x: i32 = 92;
}
```
## `add_impl`
Adds a new inherent impl for a type
```rust
// BEFORE
struct Ctx<T: Clone> {
data: T,<|>
}
// AFTER
struct Ctx<T: Clone> {
data: T,
}
impl<T: Clone> Ctx<T> {
}
```
## `add_impl_default_members`
Adds scaffold for overriding default impl members
```rust
// BEFORE
trait T {
Type X;
fn foo(&self);
fn bar(&self) {}
}
impl T for () {
Type X = ();
fn foo(&self) {}<|>
}
// AFTER
trait T {
Type X;
fn foo(&self);
fn bar(&self) {}
}
impl T for () {
Type X = ();
fn foo(&self) {}
fn bar(&self) {}
}
```
## `add_impl_missing_members`
Adds scaffold for required impl members
```rust
// BEFORE
trait T {
Type X;
fn foo(&self);
fn bar(&self) {}
}
impl T for () {<|>
}
// AFTER
trait T {
Type X;
fn foo(&self);
fn bar(&self) {}
}
impl T for () {
fn foo(&self) { unimplemented!() }
}
```
## `apply_demorgan`
Apply [De Morgan's law](https://en.wikipedia.org/wiki/De_Morgan%27s_laws).
This transforms expressions of the form `!l || !r` into `!(l && r)`.
This also works with `&&`. This assist can only be applied with the cursor
on either `||` or `&&`, with both operands being a negation of some kind.
This means something of the form `!x` or `x != y`.
```rust
// BEFORE
fn main() {
if x != 4 ||<|> !y {}
}
// AFTER
fn main() {
if !(x == 4 && y) {}
}
```
## `change_visibility`
Adds or changes existing visibility specifier.
```rust
// BEFORE
fn<|> frobnicate() {}
// AFTER
pub(crate) fn frobnicate() {}
```
## `convert_to_guarded_return`
Replace a large conditional with a guarded return.
```rust
// BEFORE
fn main() {
<|>if cond {
foo();
bar();
}
}
// AFTER
fn main() {
if !cond {
return;
}
foo();
bar();
}
```
## `fill_match_arms`
Adds missing clauses to a `match` expression.
```rust
// BEFORE
enum Action { Move { distance: u32 }, Stop }
fn handle(action: Action) {
match action {
<|>
}
}
// AFTER
enum Action { Move { distance: u32 }, Stop }
fn handle(action: Action) {
match action {
Action::Move { distance } => (),
Action::Stop => (),
}
}
```
|
