dynstack 0.4.0

A stack for trait objects that minimizes allocations
Documentation 
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# dynstack

## A stack for trait objects that minimizes allocations

**COMPATIBILITY NOTE:** `dynstack` relies on an underspecified fat pointer representation. Though
it isn't expected to change in the foreseeable future, this crate expects Rust 1.34's representation.

### Usage

`dynstack` can mostly replace anywhere you'd use a stack, or a vector that doesn't
require removal from its center.

```rust
let mut stack = DynStack::<dyn Debug>::new();
dyn_push!(stack, "hello, world!");
dyn_push!(stack, 0usize);
dyn_push!(stack, [1, 2, 3, 4, 5, 6]);

for item in stack.iter() {
    println!("{:?}", item);
}

// prints:
//  "hello, world!"
//  0
//  [1, 2, 3, 4, 5, 6]
```