fix: include original exception stacktrace when handling the script execution so if it fails on the c# part (if invoking a callback) the corresponding c# error line is captured.

Author: acoppes

src/MoonSharp.Interpreter.Tests/EndToEnd/ErrorHandlingTests.cs

@@ -127,5 +127,32 @@ function d()
 			Assert.AreEqual("!cba", res.String);
 		}
 
+		private DynValue MethodWithError()
+		{
+			throw new NullReferenceException();
+		}
+		
+		[Test]
+		public void Errors_Get_OriginalException()
+		{
+			string luaScript = 
+@"
+	callMethodWithError();
+";
+			Script script = new Script(CoreModules.None);
+
+			script.Globals["callMethodWithError"] = DynValue.NewCallback((c, a) => MethodWithError());
+
+			try
+			{
+				DynValue res = script.DoString(luaScript);
+
+			}
+			catch (Exception e)
+			{
+				Assert.IsTrue(e.StackTrace.Contains("MoonSharp.Interpreter.Tests.EndToEnd.ErrorHandlingTests.MethodWithError()"), "Exception should contain c# error line");
+			}
+		}
+
 	}
 }

src/MoonSharp.Interpreter/Execution/VM/Processor/Processor_InstructionLoop.cs

@@ -729,9 +729,9 @@ private int Internal_ExecCall(int argsCount, int instructionPtr, CallbackFunctio
 					m_ValueStack.RemoveLast(argsCount + 1);
 					m_ValueStack.Push(ret);
 				}
-				catch (Exception e)
+				catch
 				{
-					throw e;
+					throw;
 				}
 
 				m_ExecutionStack.Pop();