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error: at least one trait must be specified
--> $DIR/issue-78720.rs:1:16
|
LL | fn server() -> impl {
| ^^^^
error[E0412]: cannot find type `F` in this scope
--> $DIR/issue-78720.rs:13:12
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LL | _func: F,
| ^
--> $SRC_DIR/core/src/ops/function.rs:LL:COL
|
= note: similarly named trait `Fn` defined here
|
help: a trait with a similar name exists
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LL | _func: Fn,
| ~~
help: you might be missing a type parameter
|
LL | struct Map2<Segment2, F> {
| +++
error[E0308]: mismatched types
--> $DIR/issue-78720.rs:7:39
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LL | fn map2<F>(self, f: F) -> Map2<F> {}
| ^^ expected `Map2<F>`, found `()`
|
= note: expected struct `Map2<F>`
found unit type `()`
error[E0277]: the size for values of type `Self` cannot be known at compilation time
--> $DIR/issue-78720.rs:7:16
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LL | fn map2<F>(self, f: F) -> Map2<F> {}
| ^^^^ doesn't have a size known at compile-time
|
= help: unsized fn params are gated as an unstable feature
help: consider further restricting `Self`
|
LL | fn map2<F>(self, f: F) -> Map2<F> where Self: Sized {}
| +++++++++++++++++
help: function arguments must have a statically known size, borrowed types always have a known size
|
LL | fn map2<F>(&self, f: F) -> Map2<F> {}
| +
error: aborting due to 4 previous errors
Some errors have detailed explanations: E0277, E0308, E0412.
For more information about an error, try `rustc --explain E0277`.
|
