From e0fabca9082bb36377606c84c83f53fda01c4d65 Mon Sep 17 00:00:00 2001
From: Robin Malley <rmalley@cock.li>
Date: Sun, 26 Jun 2022 23:05:24 +0000
Subject: [PATCH] Better error message on failed coroutines

Add a full error message with traceback if the coroutine_iter_next()
function is passed a dead coroutine.
---
 src/libkore.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/libkore.c b/src/libkore.c
index 5331020..6430d4e 100644
--- a/src/libkore.c
+++ b/src/libkore.c
@@ -89,6 +89,11 @@ int coroutine_iter_next(struct co_obj *obj){
 	lua_rawgeti(L,LUA_REGISTRYINDEX,obj->ref);
 	lua_call(L,1,1);
 	const char *status = luaL_checklstring(L,-1,NULL);
+	if(strcmp(status,"dead") == 0){
+		kore_log(LOG_ERR,"Coroutine was dead when it was passed to coroutine iter next");
+		lua_pushstring(L,"Coroutine was dead when passed to coroutine iter next");
+		lua_error(L);
+	}
 	lua_pop(L,lua_gettop(L));
 	lua_getglobal(L,"coroutine");
 	lua_getfield(L,-1,"resume");