From 3d1e86f1638c71cfc4d11638dcb6b42cfd30d859 Mon Sep 17 00:00:00 2001
From: Ken Harris <kengruven@gmail.com>
Date: Wed, 12 Jun 2013 19:24:12 -0700
Subject: [PATCH] Allow DO / DO* to take bare symbols as vars.

---
 src/boot.lisp          |   14 ++++++++++----
 tests/iter-macros.lisp |   32 ++++++++++++++++++++++++--------
 2 files changed, 34 insertions(+), 12 deletions(-)

diff --git a/src/boot.lisp b/src/boot.lisp
index 16463e5..d7141f6 100644
--- a/src/boot.lisp
+++ b/src/boot.lisp
@@ -291,7 +291,9 @@
 
 (defmacro do (varlist endlist &body body)
   `(block nil
-     (let ,(mapcar (lambda (x) (list (first x) (second x))) varlist)
+     (let ,(mapcar (lambda (x) (if (symbolp x)
+                                   (list x nil)
+                                 (list (first x) (second x)))) varlist)
        (while t
          (when ,(car endlist)
            (return (progn ,@(cdr endlist))))
@@ -299,13 +301,16 @@
          (psetq
           ,@(apply #'append
                    (mapcar (lambda (v)
-                             (and (consp (cddr v))
+                             (and (listp v)
+                                  (consp (cddr v))
                                   (list (first v) (third v))))
                            varlist)))))))
 
 (defmacro do* (varlist endlist &body body)
   `(block nil
-     (let* ,(mapcar (lambda (x) (list (first x) (second x))) varlist)
+     (let* ,(mapcar (lambda (x1) (if (symbolp x1)
+                                     (list x1 nil)
+                                   (list (first x1) (second x1)))) varlist)
        (while t
          (when ,(car endlist)
            (return (progn ,@(cdr endlist))))
@@ -313,7 +318,8 @@
          (setq
           ,@(apply #'append
                    (mapcar (lambda (v)
-                             (and (consp (cddr v))
+                             (and (listp v)
+                                  (consp (cddr v))
                                   (list (first v) (third v))))
                            varlist)))))))
 
diff --git a/tests/iter-macros.lisp b/tests/iter-macros.lisp
index a19fd16..8ec2a09 100644
--- a/tests/iter-macros.lisp
+++ b/tests/iter-macros.lisp
@@ -12,15 +12,31 @@
         (= total 15)))
 
 ; DO
-(test (do ((a 0 b)                                 
-           (b 1 (+ a b))                                                          
-           (n 0 (1+ n)))                                                          
-        ((= n 10) 
+(test (do ((a 0 b)
+           (b 1 (+ a b))
+           (n 0 (1+ n)))
+        ((= n 10)
          (= a 55))))
+(test (= 5
+         (do (x) (t 5))))
+(test (= 5
+         (do ((x)) (t 5))))
+(test (= 5
+         (do ((x nil)) (t 5))))
+(test (= 5
+         (do ((x nil nil)) (t 5))))
 
 ; DO*
-(test (do* ((a 0 b)                                 
-            (b 1 (+ a b))                                                          
-            (n 0 (1+ n)))                                                          
-        ((= n 10) 
+(test (do* ((a 0 b)
+            (b 1 (+ a b))
+            (n 0 (1+ n)))
+        ((= n 10)
          (= a 512))))
+(test (= 5
+         (do* (x) (t 5))))
+(test (= 5
+         (do* ((x)) (t 5))))
+(test (= 5
+         (do* ((x nil)) (t 5))))
+(test (= 5
+         (do* ((x nil nil)) (t 5))))
-- 
1.7.10.4