From 785463ba31f2f29d29f7b23c2499fda5d8f4d9ce Mon Sep 17 00:00:00 2001
From: Pasi Kallinen <paxed@alt.org>
Date: Sat, 5 Mar 2022 18:30:30 +0200
Subject: [PATCH] Can't swallow trapped monsters

Gulping can move the trapped monster to another location, while
still being marked as trapped.  I don't want to deal with this,
so just say purple worms can't swallow trapped monsters...
---
 src/mhitm.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/mhitm.c b/src/mhitm.c
index f6c0bcbf6..4d7c4957d 100644
--- a/src/mhitm.c
+++ b/src/mhitm.c
@@ -717,6 +717,10 @@ engulf_target(struct monst *magr, struct monst *mdef)
     if (mdef->data->msize >= MZ_HUGE)
         return FALSE;
 
+    /* can't swallow trapped monsters. TODO: could do some? */
+    if (mdef->mtrapped)
+        return FALSE;
+
     /* (hypothetical) engulfers who can pass through walls aren't
      limited by rock|trees|bars */
     if ((magr == &g.youmonst) ? Passes_walls : passes_walls(magr->data))