diff --git a/extra/astar/astar-docs.factor b/extra/astar/astar-docs.factor
index d19166c1bf..7c474bdb57 100644
--- a/extra/astar/astar-docs.factor
+++ b/extra/astar/astar-docs.factor
@@ -62,8 +62,7 @@ HELP: find-path
     ", or f if no such path exists" }
 }
 { $description "Find a path between " { $snippet "start" } " and " { $snippet "target" }
-  " using the A* algorithm. The " { $snippet "astar" } " tuple must have been previously "
-  " built using " { $link <astar> } "."
+  " using the A* algorithm."
 } ;
 
 HELP: considered
@@ -77,6 +76,7 @@ HELP: considered
 
 ARTICLE: "astar" "A* algorithm"
 "The " { $vocab-link "astar" } " vocabulary implements a graph search algorithm for finding the least-cost path from one node to another." $nl
+"The " { $link astar } " tuple may be derived from and its " { $link cost } ", " { $link heuristic } ", and " { $link neighbours } " methods overwritten, or the " { $link <astar> } " word can be used to build such an object from quotations." $nl
 "Make an A* object:"
 { $subsections <astar> }
 "Find a path between nodes:"
diff --git a/extra/astar/astar.factor b/extra/astar/astar.factor
index 45f8aaa86e..85b3108217 100644
--- a/extra/astar/astar.factor
+++ b/extra/astar/astar.factor
@@ -1,6 +1,6 @@
 ! Copyright (C) 2010 Samuel Tardieu.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: accessors assocs heaps kernel math sequences sets shuffle ;
+USING: accessors assocs hash-sets heaps kernel math sequences sets shuffle ;
 IN: astar
 
 ! This implements the A* algorithm. See http://en.wikipedia.org/wiki/A*
@@ -24,10 +24,10 @@ TUPLE: (astar) astar goal origin in-open-set open-set ;
     (add-to-open-set) ;
 
 : ?add-to-open-set ( node astar -- )
-    2dup astar>> in-closed-set>> key? [ 2drop ] [ add-to-open-set ] if ;
+    2dup astar>> in-closed-set>> in? [ 2drop ] [ add-to-open-set ] if ;
 
 : move-to-closed-set ( node astar -- )
-    [ astar>> in-closed-set>> conjoin ] [ in-open-set>> delete-at ] 2bi ;
+    [ astar>> in-closed-set>> adjoin ] [ in-open-set>> delete-at ] 2bi ;
 
 : get-first ( astar -- node )
     [ open-set>> heap-pop drop dup ] [ move-to-closed-set ] bi ;
@@ -58,7 +58,7 @@ TUPLE: (astar) astar goal origin in-open-set open-set ;
 : (init) ( from to astar -- )
     swap >>goal
     H{ } clone over astar>> (>>g)
-    H{ } clone over astar>> (>>in-closed-set)
+    { } <hash-set> over astar>> (>>in-closed-set)
     H{ } clone >>origin
     H{ } clone >>in-open-set
     <min-heap> >>open-set
@@ -78,4 +78,4 @@ PRIVATE>
     astar-simple new swap >>heuristic swap >>cost swap >>neighbours ;
 
 : considered ( astar -- considered )
-    in-closed-set>> keys ;
+    in-closed-set>> members ;
diff --git a/extra/webapps/planet/planet.factor b/extra/webapps/planet/planet.factor
index eb51acbe1a..a003c8b618 100644
--- a/extra/webapps/planet/planet.factor
+++ b/extra/webapps/planet/planet.factor
@@ -1,4 +1,4 @@
-! Copyright (C) 2008 Slava Pestov.
+! Copyright (C) 2008, 2010 Slava Pestov.
 ! See http://factorcode.org/license.txt for BSD license.
 USING: kernel accessors sequences sorting math math.order
 calendar alarms logging concurrency.combinators namespaces
@@ -194,4 +194,7 @@ posting "POSTINGS"
         { planet "planet-common" } >>template ;
 
 : start-update-task ( db -- )
-    '[ _ [ update-cached-postings ] with-db ] 10 minutes every drop ;
+    '[
+        "webapps.planet"
+        [ _ [ update-cached-postings ] with-db ] with-logging
+    ] 10 minutes every drop ;
diff --git a/vm/mach_signal.cpp b/vm/mach_signal.cpp
index 5a96bdaf3f..6295381b1c 100644
--- a/vm/mach_signal.cpp
+++ b/vm/mach_signal.cpp
@@ -104,7 +104,7 @@ catch_exception_raise (mach_port_t exception_port,
 	mach_msg_type_number_t code_count)
 {
 	/* 10.6 likes to report exceptions from child processes too. Ignore those */
-	if(task != mach_task_self()) return KERN_SUCCESS;
+	if(task != mach_task_self()) return KERN_FAILURE;
 
 	/* Get fault information and the faulting thread's register contents..