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require Stack::Error to implement Debug + Display

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edef 2015-04-16 07:27:14 -04:00
parent cbfb62e62f
commit f3ee07416d
1 changed files with 2 additions and 1 deletions
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3
src/stack.rs
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@ -2,6 +2,7 @@
// See the LICENSE file included in this distribution. // See the LICENSE file included in this distribution.
//! Traits for stacks. //! Traits for stacks.
use core::prelude::*; use core::prelude::*;
use core::fmt::{Debug, Display};
/// A trait for objects that hold ownership of a stack. /// A trait for objects that hold ownership of a stack.
pub trait Stack { pub trait Stack {
@ -18,6 +19,6 @@ pub trait Stack {
/// A trait for objects that provide stacks of arbitrary size. /// A trait for objects that provide stacks of arbitrary size.
pub trait StackSource { pub trait StackSource {
type Output: Stack; type Output: Stack;
type Error = (); type Error: Debug + Display = ();
fn get_stack(size: usize) -> Result<Self::Output, Self::Error>; fn get_stack(size: usize) -> Result<Self::Output, Self::Error>;
} }