Construct an XDOC tree for a inline code directive @('...').
Macro:
(defmacro |@''| (&rest trees) (list '|@''-FN| (cons 'list trees)))
Function:
(defun |@''-FN| (trees) (declare (xargs :guard (tree-listp trees))) (make-tree-dir/&& :|@''| trees))
Theorem:
(defthm |STRINGP-OF-@''| (equal (treep (|@''-FN| trees)) (tree-listp trees)))