function registerAssignment( node ) {
		if (
			node.right.type === 'Identifier' &&
			hasOwnProp( functionHash, node.right.name )
		) {
			functionHash[ node.right.name ].private = false;
		}
	}
Registers that a known function has been assigned to a variable.

@private
@param {ASTNode} node - node to report