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Improve the function pointer docs

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* Reduce duplicate impls; show only the `fn (T)` and include a sentence
  saying that there exists up to twelve of them.
* Show `Copy` and `Clone`.
* Show auto traits like `Send` and `Sync`, and blanket impls like `Any`.
This commit is contained in:
Michael Howell 2022-06-16 14:14:38 -07:00
parent 1169832f2f
commit 5271e32c46
12 changed files with 222 additions and 69 deletions
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10
compiler/rustc_error_codes/src/error_codes/E0118.md
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@ -4,7 +4,7 @@ enum, union, or trait object.
Erroneous code example:
```compile_fail,E0118
impl fn(u8) { // error: no nominal type found for inherent implementation
impl<T> T { // error: no nominal type found for inherent implementation
fn get_state(&self) -> String {
// ...
}
@ -20,8 +20,8 @@ trait LiveLongAndProsper {
fn get_state(&self) -> String;
}
// and now you can implement it on fn(u8)
impl LiveLongAndProsper for fn(u8) {
// and now you can implement it on T
impl<T> LiveLongAndProsper for T {
fn get_state(&self) -> String {
"He's dead, Jim!".to_owned()
}
@ -33,9 +33,9 @@ For example, `NewType` is a newtype over `Foo` in `struct NewType(Foo)`.
Example:
```
struct TypeWrapper(fn(u8));
struct TypeWrapper<T>(T);
impl TypeWrapper {
impl<T> TypeWrapper<T> {
fn get_state(&self) -> String {
"Fascinating!".to_owned()
}