grammar bit

<Someone> wrote:
> You find an anti-magic field.
> Where do you want to jump?  (For instructions type a ?)
> You pass right over _a_ anti-magic field.

doc/fixes34.4

@@ -219,6 +219,7 @@ create_object() created lizard corpses without timers and troll corpses with
 	their revive timers, then changed the corpsenm field
 when a potion of acid was dropped into water and exploded, nethack would
 	continue to use already freed memory and later might panic or crash
+when jumping over an already seen trap, use an() to get appropriate grammar
 
 
 Platform- and/or Interface-Specific Fixes

src/dothrow.c

@@ -561,9 +561,8 @@ hurtle_step(arg, x, y)
 		return TRUE;
     	} else {
 		if (ttmp->tseen)
-		    You("pass right over %s %s.",
-		    	(ttmp->ttyp == ARROW_TRAP) ? "an" : "a",
-		    	defsyms[trap_to_defsym(ttmp->ttyp)].explanation);
+		    You("pass right over %s.",
+		    	an(defsyms[trap_to_defsym(ttmp->ttyp)].explanation));
     	}
     }
     if (--*range < 0)		/* make sure our range never goes negative */