1.0.31.7: transform %FIND-POSITION for strings

[sbcl.git] / src / code / primordial-extensions.lisp

diff --git a/src/code/primordial-extensions.lisp b/src/code/primordial-extensions.lisp
index e25ed15..2677f6c 100644 (file)
--- a/src/code/primordial-extensions.lisp
+++ b/src/code/primordial-extensions.lisp
@@ -145,7 +145,9 @@
        (declare (inline ,fun))
        (etypecase ,var
          ,@(loop for type in types
-                 collect `(,type (,fun (the ,type ,var))))))))
+                 ;; TRULY-THE allows transforms to take advantage of the type
+                 ;; information without need for constraint propagation.
+                 collect `(,type (,fun (truly-the ,type ,var))))))))
 
 ;;; Automate an idiom often found in macros:
 ;;;   (LET ((FOO (GENSYM "FOO"))