-static void chkshot(BULLET *, BULLET *);
-static void chkslime(BULLET *, BULLET *);
-static void explshot(BULLET *, int, int);
-static void find_under(BULLET *, BULLET *);
-static int iswall(int, int);
-static void mark_boot(BULLET *);
-static void mark_player(BULLET *);
+static void chkshot(BULLET *, BULLET *);
+static void chkslime(BULLET *, BULLET *);
+static void explshot(BULLET *, int, int);
+static void find_under(BULLET *, BULLET *);
+static bool iswall(int, int);
+static void mark_boot(BULLET *);
+static void mark_player(BULLET *);