Minor cleanup

src/julia-syntax.scm

@@ -3709,14 +3709,14 @@ f(x) = yt(x)
                     (m (or m (let ((l (make-label)))
                                (put! label-map (cadr e) l)
                                l))))
-               (emit `(null))  ;; save space for `leave` and `pop_exc` that might be needed
+               (emit `(null))  ;; save space for `leave` that might be needed
                (emit `(goto ,m))
                (set! handler-goto-fixups
                      (cons (list code handler-level catch-token-stack (cadr e)) handler-goto-fixups))
                #f))
 
             ;; exception handlers are lowered using
-            ;; (= tok (enter L)) - push handler with catch block at label L
+            ;; (= tok (enter L)) - push handler with catch block at label L, yielding token
             ;; (leave n) - pop N exception handlers
             ;; (pop_exc tok) - pop exception stack back to state of associated enter
             ((trycatch tryfinally)

src/task.c

@@ -267,8 +267,7 @@ static void NOINLINE JL_NORETURN JL_USED_FUNC start_task(void)
             res = jl_apply(&t->start, 1);
         }
         JL_CATCH {
-            // FIXME: Persist exception stack into `exception`?
-            // Refactor with jl_push_exc_stack above?
+            // TODO: Persist exception stack as above?
             res = jl_current_exception();
             t->exception = res;
             jl_gc_wb(t, res);

src/threading.c

@@ -283,7 +283,7 @@ static void ti_initthread(int16_t tid)
     }
     memset(bt_data, 0, sizeof(uintptr_t) * (JL_MAX_BT_SIZE + 1));
     ptls->bt_data = (uintptr_t*)bt_data;
-    ptls->exc_stack = 0;
+    ptls->exc_stack = NULL;
     jl_reserve_exc_stack(&ptls->exc_stack, JL_MAX_BT_SIZE + 2);
     ptls->sig_exception = NULL;
 #ifdef _OS_WINDOWS_