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a0cfda53c4
closes #13367 [breaking-change] Use `Sized?` to indicate a dynamically sized type parameter or trait (used to be `type`). E.g., ``` trait Tr for Sized? {} fn foo<Sized? X: Share>(x: X) {} ```
82 lines
2.1 KiB
Rust
82 lines
2.1 KiB
Rust
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// Test sized-ness checking in substitution.
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// Unbounded.
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fn f1<Sized? X>(x: &X) {
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f2::<X>(x); //~ ERROR instantiating a type parameter with an incompatible type `X`, which does n
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}
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fn f2<X>(x: &X) {
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}
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// Bounded.
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trait T for Sized? {}
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fn f3<Sized? X: T>(x: &X) {
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f4::<X>(x); //~ ERROR instantiating a type parameter with an incompatible type `X`, which does n
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}
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fn f4<X: T>(x: &X) {
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}
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// Test with unsized enum.
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enum E<Sized? X> {
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V(X),
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}
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fn f5<Y>(x: &Y) {}
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fn f6<Sized? X>(x: &X) {}
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fn f7<Sized? X>(x1: &E<X>, x2: &E<X>) {
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f5(x1); //~ERROR instantiating a type parameter with an incompatible type `E<X>`, which does not
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f6(x2); // ok
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}
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// Test with unsized struct.
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struct S<Sized? X> {
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x: X,
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}
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fn f8<Sized? X>(x1: &S<X>, x2: &S<X>) {
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f5(x1); //~ERROR instantiating a type parameter with an incompatible type `S<X>`, which does not
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f6(x2); // ok
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}
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// Test some tuples.
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fn f9<Sized? X>(x1: Box<S<X>>, x2: Box<E<X>>) {
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f5(&(*x1, 34i)); //~ERROR instantiating a type parameter with an incompatible type `(S<X>,int)`,
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f5(&(32i, *x2)); //~ERROR instantiating a type parameter with an incompatible type `(int,E<X>)`,
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}
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// I would like these to fail eventually.
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/*
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// impl - bounded
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trait T1<Z: T> {
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}
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struct S3<Sized? Y>;
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impl<Sized? X: T> T1<X> for S3<X> { //ERROR instantiating a type parameter with an incompatible type
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}
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// impl - unbounded
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trait T2<Z> {
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}
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impl<Sized? X> T2<X> for S3<X> { //ERROR instantiating a type parameter with an incompatible type `X
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// impl - struct
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trait T3<Sized? Z> {
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}
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struct S4<Y>;
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impl<Sized? X> T3<X> for S4<X> { //ERROR instantiating a type parameter with an incompatible type `X
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}
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*/
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pub fn main() {
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}
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