Yeah, once I've gotten the binding down I hope to be able to do something like:

use Slang::Scheme::Guile;

guile-sub add( $a, $b ) { + $a $b }

say add(1,3); # 4
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because my *ultimate* goal is to use this to embed the logic programming language Kanren into Perl 6, which is a set of Scheme primitives that provide goal-searching and backtracking. You could do something like:

use Slang::Kanren;

kanren-fact parent('marcia','jeff');
kanren-fact parent('mike','jeff');
kanren-fact parent('gerald','mike');

# Find out if Jeff shares a common parent with Gerald
kanren-goal { parent('gerald',X), parent(X,'jeff') }
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This is of course fairly abstract, and I haven't really researched what the function binding is, I've been working more on the Scheme side.