72d17bfebb
There's an existing fast path for the `type_op_prove_predicate` predicate, checking for trivially `Sized` types, which can be re-used when evaluating obligations within queries. This should improve performance, particularly in anticipation of new sizedness traits being added which can take advantage of this.
59 lines
1.8 KiB
Text
59 lines
1.8 KiB
Text
error: at least one trait must be specified
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--> $DIR/issue-78720.rs:1:16
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LL | fn server() -> impl {
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| ^^^^
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error[E0412]: cannot find type `F` in this scope
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--> $DIR/issue-78720.rs:14:12
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LL | _func: F,
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| ^
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--> $SRC_DIR/core/src/ops/function.rs:LL:COL
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= note: similarly named trait `Fn` defined here
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help: a trait with a similar name exists
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LL | _func: Fn,
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| +
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help: you might be missing a type parameter
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LL | struct Map2<Segment2, F> {
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| +++
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error[E0282]: type annotations needed
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--> $DIR/issue-78720.rs:1:16
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LL | fn server() -> impl {
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| ^^^^ cannot infer type
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error[E0308]: mismatched types
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--> $DIR/issue-78720.rs:8:39
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LL | fn map2<F>(self, f: F) -> Map2<F> {}
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| ^^ expected `Map2<F>`, found `()`
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= note: expected struct `Map2<F>`
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found unit type `()`
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error[E0277]: the size for values of type `Self` cannot be known at compilation time
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--> $DIR/issue-78720.rs:8:16
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LL | fn map2<F>(self, f: F) -> Map2<F> {}
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| ^^^^ doesn't have a size known at compile-time
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= help: unsized fn params are gated as an unstable feature
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help: consider further restricting `Self`
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LL | fn map2<F>(self, f: F) -> Map2<F> where Self: Sized {}
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| +++++++++++++++++
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help: function arguments must have a statically known size, borrowed types always have a known size
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LL | fn map2<F>(&self, f: F) -> Map2<F> {}
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| +
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error: aborting due to 5 previous errors
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Some errors have detailed explanations: E0277, E0282, E0308, E0412.
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For more information about an error, try `rustc --explain E0277`.
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