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Distinguish elaboration vs supertrait expansion. Elaboration considers
all where-clauses, but supertrait considers a more limited set. Supertrait expansion is suitable for virtual tables and associated type inclusion, elaboration for more general reasoning. Fixes rust-lang#20671.
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// Copyright 2013 The Rust Project Developers. See the COPYRIGHT | ||
// file at the top-level directory of this distribution and at | ||
// http://rust-lang.org/COPYRIGHT. | ||
// | ||
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | ||
// option. This file may not be copied, modified, or distributed | ||
// except according to those terms. | ||
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// Tests a case where we need to consider the where-clauses of `Foo`, | ||
// and not just its supetraits, to infer that `A:Foo` holds. | ||
// Issue #20671. | ||
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trait Foo<T> { | ||
fn foo(&self) -> &T; | ||
} | ||
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trait Bar<A> where A: Foo<Self> { | ||
fn dummy(&self, a: A); | ||
} | ||
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fn foobar<A, B: Bar<A>>(a: &A) -> &B { | ||
a.foo() | ||
} | ||
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fn main() { } |