diff --git a/src/ikarus.boot b/src/ikarus.boot
index b41eadc..a99a657 100644
Binary files a/src/ikarus.boot and b/src/ikarus.boot differ
diff --git a/src/ikarus.compiler.ss b/src/ikarus.compiler.ss
index 680d70e..4320745 100644
--- a/src/ikarus.compiler.ss
+++ b/src/ikarus.compiler.ss
@@ -5,7 +5,7 @@
   (import 
     (only (ikarus system $codes) $code->closure)
     (only (ikarus system $records) $record-ref $record/rtd?)
-    (except (ikarus) ;fasl-write
+    (except (ikarus)
         compile-core-expr-to-port assembler-output
         current-primitive-locations eval-core)
     (ikarus intel-assembler)
@@ -3190,12 +3190,6 @@
       [(base-rtd)           (mem 44 pcr)]
       [else (error 'pcb-ref "invalid arg ~s" x)])))
 
-(define do-warn
-  (let ([ls '()])
-    (lambda (x) 
-      (unless (memq x ls)
-        (printf "[ERR ~s] " x)
-        (set! ls (cons x ls))))))
 
 (define (primref-loc op)
   (unless (symbol? op) (error 'primref-loc "not a symbol ~s" op))
@@ -3207,9 +3201,7 @@
             "~s is not a valid location for ~s" x op))
        (mem (fx- disp-symbol-value symbol-tag) (obj x)))]
     [else
-     (do-warn op)
-     (mem (fx- disp-symbol-system-value symbol-tag)
-          (obj op))]))
+     (error 'compile "cannot find location of primitive ~s" op)]))
 
 
 (define (generate-code x)
diff --git a/src/makefile.ss b/src/makefile.ss
index 6f66237..f6f1896 100755
--- a/src/makefile.ss
+++ b/src/makefile.ss
@@ -114,7 +114,6 @@
       [$arg-list (ikarus system $arg-list)]
       [$stack (ikarus system $stack)]
       [$junkyard (ikarus system $junkyard)]
-      ;[$lists (ikarus system $lists)]
       ))
 
   (define ikarus-macros-map
@@ -718,7 +717,8 @@
                     (lambda (x)
                       (cond
                         [(assq x locs) => cdr]
-                        [else #f]))])
+                        [else 
+                         (error 'bootstrap "no location for ~s" x)]))])
       (let ([p (open-output-file "ikarus.boot" 'replace)])
         (for-each 
           (lambda (x) (compile-core-expr-to-port x p))