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use std::marker;
struct A;
struct B;
struct C;
struct Foo<T = A, U = B, V = C>(marker::PhantomData<(T,U,V)>);
struct Hash<T>(marker::PhantomData<T>);
struct HashMap<K, V, H = Hash<K>>(marker::PhantomData<(K,V,H)>);
fn main() {
// Ensure that the printed type doesn't include the default type params...
let _: Foo<isize> = ();
//~^ ERROR mismatched types
//~| expected `Foo<isize>`, found `()`
//~| expected struct `Foo<isize>`
//~| found unit type `()`
// ...even when they're present, but the same types as the defaults.
let _: Foo<isize, B, C> = ();
//~^ ERROR mismatched types
//~| expected `Foo<isize>`, found `()`
//~| expected struct `Foo<isize>`
//~| found unit type `()`
// Including cases where the default is using previous type params.
let _: HashMap<String, isize> = ();
//~^ ERROR mismatched types
//~| expected `HashMap<String, isize>`, found `()`
//~| expected struct `HashMap<String, isize>`
//~| found unit type `()`
let _: HashMap<String, isize, Hash<String>> = ();
//~^ ERROR mismatched types
//~| expected `HashMap<String, isize>`, found `()`
//~| expected struct `HashMap<String, isize>`
//~| found unit type `()`
// But not when there's a different type in between.
let _: Foo<A, isize, C> = ();
//~^ ERROR mismatched types
//~| expected `Foo<A, isize>`, found `()`
//~| expected struct `Foo<A, isize>`
//~| found unit type `()`
// And don't print <> at all when there's just defaults.
let _: Foo<A, B, C> = ();
//~^ ERROR mismatched types
//~| expected `Foo`, found `()`
//~| expected struct `Foo`
//~| found unit type `()`
}
|
