From f0ed322ed47a3849973f00951a6f9978ede58b78 Mon Sep 17 00:00:00 2001
From: "Noah C. Green" <noahc.green@icloud.com>
Date: Thu, 6 Aug 2020 20:57:34 -0400
Subject: [PATCH] Python exceptions within coroutines are reraised

---
 lupa/_lupa.pyx     | 6 +++++-
 lupa/tests/test.py | 9 +++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/lupa/_lupa.pyx b/lupa/_lupa.pyx
index cabbfccf..1268d7c4 100644
--- a/lupa/_lupa.pyx
+++ b/lupa/_lupa.pyx
@@ -1294,7 +1294,11 @@ cdef int raise_lua_error(LuaRuntime runtime, lua_State* L, int result) except -1
     elif result == lua.LUA_ERRMEM:
         raise MemoryError()
     else:
-        raise LuaError( build_lua_error_message(runtime, L, None, -1) )
+        error = py_from_lua(runtime, L, 1)
+        if isinstance(error, BaseException):
+            runtime.reraise_on_exception()
+        else:
+            raise LuaError( build_lua_error_message(runtime, L, None, -1) )
 
 cdef build_lua_error_message(LuaRuntime runtime, lua_State* L, unicode err_message, int n):
     cdef size_t size = 0
diff --git a/lupa/tests/test.py b/lupa/tests/test.py
index f081b0e8..110117a8 100644
--- a/lupa/tests/test.py
+++ b/lupa/tests/test.py
@@ -1509,6 +1509,15 @@ def test_coroutine_while_status(self):
             result.append(_next(gen))
         self.assertEqual([0,1,0,1,0,1], result)
 
+    def test_coroutine_reraises_python_error(self):
+        lua_code = '''\
+        function(test)
+            test()
+        end'''
+        f = self.lua.eval(lua_code)
+        gen = f.coroutine(lambda: int('hello'))
+        self.assertRaises(ValueError, lambda: gen.send(None))
+
 
 class TestLuaCoroutinesWithDebugHooks(SetupLuaRuntimeMixin, unittest.TestCase):