rust/tests/ui/closures/issue-78720.rs

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fn server() -> impl {
//~^ ERROR at least one trait must be specified
().map2(|| "")
//~^ ERROR type annotations needed
}
trait FilterBase2 {
fn map2<F>(self, f: F) -> Map2<F> {}
//~^ ERROR mismatched types
//~^^ ERROR the size for values of type `Self` cannot be known at compilation time
}
struct Map2<Segment2> {
_func: F,
//~^ ERROR cannot find type `F` in this scope
}
impl<F> FilterBase2 for F {}
fn main() {}