A linked list of
usizes that functions as a stack.
Used to keep track of the current stack frame while preserving
the indicies of past frames.
Create a new linked stack provided the first item. A linked stack can not be empty.
Add a new entry to the top of the linked stack.
Remove the top entry of the linked stack, returning the top value.
Peek at the current item on top of the stack.
impl RefUnwindSafe for Linked
impl UnwindSafe for Linked
type Error = Infallible
The type returned in the event of a conversion error.