--- dgnushack.el~	Mon Feb 12 21:54:27 2001
+++ dgnushack.el	Wed Feb 28 23:38:33 2001
@@ -70,6 +70,93 @@
 	   (while (consp (cdr x))
 	     (pop x))
 	   x))))
+
+  (define-compiler-macro coerce (&whole form x type)
+    (if (and (fboundp 'coerce)
+	     (subrp (symbol-function 'coerce)))
+	form
+      `(let ((x ,x)
+	     (type ,type))
+	 (cond ((eq type 'list) (if (listp x) x (append x nil)))
+	       ((eq type 'vector) (if (vectorp x) x (vconcat x)))
+	       ((eq type 'string) (if (stringp x) x (concat x)))
+	       ((eq type 'array) (if (arrayp x) x (vconcat x)))
+	       ((and (eq type 'character) (stringp x) (= (length x) 1))
+		(aref x 0))
+	       ((and (eq type 'character) (symbolp x)
+		     (= (length (symbol-name x)) 1))
+		(aref (symbol-name x) 0))
+	       ((eq type 'float) (float x))
+	       ((typep x type) x)
+	       (t (error "Can't coerce %s to type %s" x type))))))
+
+  (define-compiler-macro merge (&whole form type seq1 seq2 pred &rest keys)
+    (if (and (fboundp 'merge)
+	     (subrp (symbol-function 'merge)))
+	form
+      `(let ((type ,type)
+	     (seq1 ,seq1)
+	     (seq2 ,seq2)
+	     (pred ,pred))
+	 (or (listp seq1) (setq seq1 (append seq1 nil)))
+	 (or (listp seq2) (setq seq2 (append seq2 nil)))
+	 (let ((res nil))
+	   (while (and seq1 seq2)
+	     (if (funcall pred (car seq2) (car seq1))
+		 (push (pop seq2) res)
+	       (push (pop seq1) res)))
+	   (coerce (nconc (nreverse res) seq1 seq2) type)))))
+
+  (define-compiler-macro subseq (&whole form seq start &optional end)
+    (if (and (fboundp 'subseq)
+	     (subrp (symbol-function 'subseq)))
+	form
+      (if end
+	  `(let ((seq ,seq)
+		 (start ,start)
+		 (end ,end))
+	     (if (stringp seq)
+		 (substring seq start end)
+	       (let (len)
+		 (if (< end 0)
+		     (setq end (+ end (setq len (length seq)))))
+		 (if (< start 0)
+		     (setq start (+ start (or len (setq len (length seq))))))
+		 (cond ((listp seq)
+			(if (> start 0)
+			    (setq seq (nthcdr start seq)))
+			(let ((res nil))
+			  (while (>= (setq end (1- end)) start)
+			    (push (pop seq) res))
+			  (nreverse res)))
+		       (t
+			(let ((res (make-vector (max (- end start) 0) nil))
+			      (i 0))
+			  (while (< start end)
+			    (aset res i (aref seq start))
+			    (setq i (1+ i)
+				  start (1+ start)))
+			  res))))))
+	`(let ((seq ,seq)
+	       (start ,start))
+	   (if (stringp seq)
+	       (substring seq start)
+	     (let (len)
+	       (if (< start 0)
+		   (setq start (+ start (or len (setq len (length seq))))))
+	       (cond ((listp seq)
+		      (if (> start 0)
+			  (setq seq (nthcdr start seq)))
+		      (copy-sequence seq))
+		     (t
+		      (let* ((end (or len (length seq)))
+			     (res (make-vector (max (- end start) 0) nil))
+			     (i 0))
+			(while (< start end)
+			  (aset res i (aref seq start))
+			  (setq i (1+ i)
+				start (1+ start)))
+			res)))))))))
   )
 
 ;; If we are building w3 in a different directory than the source