diff --git a/arc.pir b/arc.pir
index 05b92ab..6a99abd 100644
--- a/arc.pir
+++ b/arc.pir
@@ -19,6 +19,12 @@
 		.local int is_pir
 		is_pir = 0
 
+		## save start up time
+		$N0 = time
+		$P0 = new 'ArcNum'
+		$P0 = $N0
+		set_hll_global '$startup-time', $P0
+		
 		load_bytecode 'ac/boot.pbc'
 		load_bytecode 'ac/comp.pbc'
 		load_bytecode 'ac/qq.pbc'
@@ -36,7 +42,7 @@
     ## default value for ***
     $P1 = get_hll_global 'nil'
     set_hll_global '***', $P1
-		#push_eh run_error
+		push_eh run_error
 loop:
     unless iter goto end 
     $S0 = shift iter
@@ -66,7 +72,7 @@ run_error:
 eval_mode:
     $P0 = getstdin
 loop2:
-    #push_eh error # never give up
+    push_eh error # never give up
     $S0 = $P0.'readline_interactive'( 'arc> ' )
     $P2 = _compile_and_eval($S0)
 		##print ' -> '
diff --git a/builtins.pir b/builtins.pir
index d026907..caaf05b 100644
--- a/builtins.pir
+++ b/builtins.pir
@@ -428,9 +428,14 @@ end:
 .sub 'ccc'
    .param pmc f
 
-   interpinfo $P0, .INTERPINFO_CURRENT_CONT
-
-   .tailcall f($P0)
+	 $P0 = new 'Continuation'
+	 set_addr $P0, continue
+   $P0 = f($P0)
+continue:
+#	 .local pmc res
+#   .get_results (res)
+#	 .return (res)
+	 .return ($P0)
 .end
 
 .sub 'pr'
@@ -984,7 +989,13 @@ handle_err:
 ## only stubs
 
 .sub 'msec'
-   .return (0)
+	 $N0 = time
+	 $P0 = get_hll_global '$startup-time'
+	 $N1 = $P0
+	 $N0 = $N0 - $N1
+	 $N0 = $N0*1000000
+	 $I0 = $N0
+   .return ($I0)
 .end
 
 .sub 'current-process-milliseconds'