X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Firrat.lisp;h=71619ee03b61e4124a50e587bb2e13a96ab5b77e;hb=4078d29d83e45a0b059ca5a71877ec36a4174a01;hp=55dbb831a1d2bf5ea1ed8eace0b6125c4f3da7d9;hpb=9510443d0bd00fcbd0213e07a5340e66d9ce7301;p=sbcl.git

diff --git a/src/code/irrat.lisp b/src/code/irrat.lisp
index 55dbb83..71619ee 100644
--- a/src/code/irrat.lisp
+++ b/src/code/irrat.lisp
@@ -178,10 +178,15 @@
   #!+sb-doc
   "Return BASE raised to the POWER."
   (if (zerop power)
-      (let ((result (1+ (* base power))))
-        (if (and (floatp result) (float-nan-p result))
-            (float 1 result)
-            result))
+    (if (and (zerop base) (floatp power))
+        (error 'arguments-out-of-domain-error
+               :operands (list base power)
+               :operation 'expt
+               :references (list '(:ansi-cl :function expt)))
+        (let ((result (1+ (* base power))))
+          (if (and (floatp result) (float-nan-p result))
+              (float 1 result)
+              result)))
     (labels (;; determine if the double float is an integer.
              ;;  0 - not an integer
              ;;  1 - an odd int