135 lines
3.2 KiB
Rust
135 lines
3.2 KiB
Rust
#![feature(associated_type_defaults)]
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struct S;
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mod method {
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trait A {
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fn a(&self) { }
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}
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pub trait B {
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fn b(&self) { }
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}
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pub trait C: A + B {
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fn c(&self) { }
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}
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impl A for ::S {}
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impl B for ::S {}
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impl C for ::S {}
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}
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mod assoc_const {
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trait A {
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const A: u8 = 0;
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}
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pub trait B {
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const B: u8 = 0;
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}
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pub trait C: A + B {
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const C: u8 = 0;
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}
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impl A for ::S {}
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impl B for ::S {}
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impl C for ::S {}
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}
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mod assoc_ty {
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trait A {
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type A = u8;
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}
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pub trait B {
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type B = u8;
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}
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pub trait C: A + B {
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type C = u8;
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}
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impl A for ::S {}
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impl B for ::S {}
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impl C for ::S {}
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}
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fn check_method() {
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// A is private
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// B is pub, not in scope
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// C : A + B is pub, in scope
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use method::C;
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// Methods, method call
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// a, b, c are resolved as trait items, their traits need to be in scope
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S.a(); //~ ERROR no method named `a` found
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S.b(); //~ ERROR no method named `b` found
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S.c(); // OK
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// a, b, c are resolved as inherent items, their traits don't need to be in scope
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let c = &S as &dyn C;
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c.a(); //~ ERROR associated function `a` is private
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c.b(); // OK
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c.c(); // OK
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// Methods, UFCS
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// a, b, c are resolved as trait items, their traits need to be in scope
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S::a(&S);
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//~^ ERROR no function or associated item named `a` found
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S::b(&S);
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//~^ ERROR no function or associated item named `b` found
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S::c(&S); // OK
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// a, b, c are resolved as inherent items, their traits don't need to be in scope
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<dyn C>::a(&S); //~ ERROR associated function `a` is private
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<dyn C>::b(&S); // OK
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C::c(&S); // OK
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}
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fn check_assoc_const() {
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// A is private
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// B is pub, not in scope
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// C : A + B is pub, in scope
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use assoc_const::C;
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// Associated constants
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// A, B, C are resolved as trait items, their traits need to be in scope
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S::A; //~ ERROR no associated item named `A` found
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S::B; //~ ERROR no associated item named `B` found
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S::C; // OK
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// A, B, C are resolved as inherent items, their traits don't need to be in scope
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<dyn C>::A; //~ ERROR associated constant `A` is private
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//~^ ERROR the trait `assoc_const::C` cannot be made into an object
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<dyn C>::B; // ERROR the trait `assoc_const::C` cannot be made into an object
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C::C; // OK
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}
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fn check_assoc_ty<T: assoc_ty::C>() {
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// A is private
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// B is pub, not in scope
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// C : A + B is pub, in scope
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use assoc_ty::C;
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// Associated types
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// A, B, C are resolved as trait items, their traits need to be in scope, not implemented yet
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let _: S::A; //~ ERROR ambiguous associated type
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let _: S::B; //~ ERROR ambiguous associated type
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let _: S::C; //~ ERROR ambiguous associated type
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// A, B, C are resolved as inherent items, their traits don't need to be in scope
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let _: T::A; //~ ERROR associated type `A` is private
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let _: T::B; // OK
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let _: T::C; // OK
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// Associated types, bindings
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let _: dyn assoc_ty::B<
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B = u8, // OK
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>;
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let _: dyn C<
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A = u8, //~ ERROR associated type `A` is private
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B = u8, // OK
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C = u8, // OK
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>;
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}
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fn main() {}
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