mirror of https://github.com/rust-lang/rust
44 lines
937 B
Rust
44 lines
937 B
Rust
//@ revisions: base extended
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#![cfg_attr(extended, feature(generic_associated_types_extended))]
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#![cfg_attr(extended, allow(incomplete_features))]
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pub trait SubTrait {}
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pub trait SuperTrait {
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type SubType<'a>: SubTrait where Self: 'a;
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fn get_sub<'a>(&'a mut self) -> Self::SubType<'a>;
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}
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pub struct SubStruct<'a> {
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sup: &'a mut SuperStruct,
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}
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impl<'a> SubTrait for SubStruct<'a> {}
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pub struct SuperStruct {
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value: u8,
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}
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impl SuperStruct {
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pub fn new(value: u8) -> SuperStruct {
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SuperStruct { value }
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}
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}
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impl SuperTrait for SuperStruct {
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type SubType<'a> = SubStruct<'a>;
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fn get_sub<'a>(&'a mut self) -> Self::SubType<'a> {
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SubStruct { sup: self }
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}
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}
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fn main() {
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let sub: Box<dyn SuperTrait<SubType = SubStruct>> = Box::new(SuperStruct::new(0));
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//~^ ERROR missing generics for associated type
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//[base]~^^ ERROR the trait
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//[base]~| ERROR the trait
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}
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