fix: copy SourceMap in vm OpClosure branch (#392)

script_test.go

@@ -541,6 +541,38 @@ func (n *customNumber) binaryOpInt(op token.Token, rhs *tengo.Int) (tengo.Object
 	return nil, tengo.ErrInvalidOperator
 }
 
+func TestScript_ImportError(t *testing.T) {
+	m := `
+	exp := import("expression")
+	r := exp(ctx)
+`
+
+	src := `
+export func(ctx) {
+	closure := func() {
+		if ctx.actiontimes < 0 { // an error is thrown here because actiontimes is undefined
+			return true
+		}
+		return false
+	}
+
+	return closure()
+}`
+
+	s := tengo.NewScript([]byte(m))
+	mods := tengo.NewModuleMap()
+	mods.AddSourceModule("expression", []byte(src))
+	s.SetImports(mods)
+
+	err := s.Add("ctx", map[string]interface{}{
+		"ctx": 12,
+	})
+	require.NoError(t, err)
+
+	_, err = s.Run()
+	require.True(t, strings.Contains(err.Error(), "expression:4:6"))
+}
+
 func compile(t *testing.T, input string, vars M) *tengo.Compiled {
 	s := tengo.NewScript([]byte(input))
 	for vn, vv := range vars {

vm.go

@@ -767,6 +767,7 @@ func (v *VM) run() {
 				NumLocals:     fn.NumLocals,
 				NumParameters: fn.NumParameters,
 				VarArgs:       fn.VarArgs,
+				SourceMap:     fn.SourceMap,
 				Free:          free,
 			}
 			v.allocs--