X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcompiler%2Flexenv.lisp;h=5eba1fabae94d93bef1bebb955e84a4302d46afb;hb=3a2c2a2217f77e0d1a44a581c83e0311ebc2594a;hp=34b4a59e792caf3bd8098b048524a88a161135aa;hpb=62b0a9c5190806368487d46d8773734cb1ee3a25;p=sbcl.git

diff --git a/src/compiler/lexenv.lisp b/src/compiler/lexenv.lisp
index 34b4a59..5eba1fa 100644
--- a/src/compiler/lexenv.lisp
+++ b/src/compiler/lexenv.lisp
@@ -15,7 +15,8 @@
 ;;; (This is also what shows up as an ENVIRONMENT value in macroexpansion.)
 #!-sb-fluid (declaim (inline internal-make-lexenv)) ; only called in one place
 (def!struct (lexenv
-	     (:constructor make-null-lexenv ())
+	     (:print-function print-lexenv)
+	     (:constructor make-null-lexenv ())	     
 	     (:constructor internal-make-lexenv
 			   (funs vars blocks tags
                                  type-restrictions
@@ -69,6 +70,15 @@
     (null (make-null-lexenv))
     (lexenv x)))
 
+(defun null-lexenv-p (lexenv)
+  (equalp (coerce-to-lexenv lexenv) (make-null-lexenv)))
+
+(defun print-lexenv (lexenv stream level)
+  (if (null-lexenv-p lexenv)
+      (print-unreadable-object (lexenv stream)
+	(write-string "NULL-LEXENV" stream))
+      (default-structure-print lexenv stream level)))
+
 (defun maybe-inline-syntactic-closure (lambda lexenv)
   (declare (type list lambda) (type lexenv lexenv))
   (aver (eql (first lambda) 'lambda))