Perl 6
Default SMOP Interpreter Implementation: Revision 5
The default SMOP Interpreter Implementation (aka SLIME) implements simply a frame object that have nodes. The parts of this implementation are:

* A Node prototype and its instances
* A Frame prototype and its instances
* Lowlevel operators that manipulate the Frame


The Node prototype just declares an object that have a set of members.

* responder
* identifier
* capture
* debug
* result
* jail

This members can be passed to as named arguments.

^ SMOP__SLIME__Frame

The Frame prototype defines the implementation in itself, it's the one with the "eval" method. It has the following members.

* lexical
* back
* nodes
* current

And the following methods:

* new(SMOP__SLIME__Frame: *@nodes) -- creates a new frame object defining the nodes.
* next($frame: ) -- goes to the next node in the stack, possibly drop frames.
* goto($frame: $node) -- sets the node as the currently selected node.
* eval($frame: ) -- evaluates the currently selected node and stores the result in the result field of the node.
* result($frame: $count) -- gets the result of the past node that is $count away from the current node.
* has_next($frame: ) -- returns true if there's any more node to eval.
* setr($frame: $value) -- sets the result of the current node to the given value.

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