mirror of
https://github.com/rust-lang/rust.git
synced 2024-12-11 16:15:03 +00:00
27 lines
655 B
Rust
27 lines
655 B
Rust
// Regression test for #55241:
|
|
//
|
|
// The reference to `C::HASHED_NULL_NODE` resulted in a type like `<C
|
|
// as NodeCodec<_>>::Out`; normalizing this type requires knowing the
|
|
// value of `_`; solving that requires having normalized, so we can
|
|
// test against `C: NodeCodec<H>` in the environment.
|
|
//
|
|
//@ run-pass
|
|
|
|
pub trait Hasher {
|
|
type Out: Eq;
|
|
}
|
|
|
|
pub trait NodeCodec<H: Hasher> {
|
|
const HASHED_NULL_NODE: H::Out;
|
|
}
|
|
|
|
pub trait Trie<H: Hasher, C: NodeCodec<H>> {
|
|
/// Returns the root of the trie.
|
|
fn root(&self) -> &H::Out;
|
|
|
|
/// Is the trie empty?
|
|
fn is_empty(&self) -> bool { *self.root() == C::HASHED_NULL_NODE }
|
|
}
|
|
|
|
fn main() { }
|