diff --git a/cl/error_msg_test.go b/cl/error_msg_test.go
index fe2bf1df5..4a4e1a589 100644
--- a/cl/error_msg_test.go
+++ b/cl/error_msg_test.go
@@ -23,6 +23,7 @@ import (
 	"runtime"
 	"testing"
 
+	"github.com/goplus/gop/ast"
 	"github.com/goplus/gop/cl"
 	"github.com/goplus/gop/parser"
 	"github.com/goplus/gop/parser/fsx/memfs"
@@ -53,6 +54,24 @@ func codeErrorTestEx(t *testing.T, pkgname, filename, msg, src string) {
 	}
 }
 
+func codeErrorTestAst(t *testing.T, pkgname, filename, msg, src string) {
+	f, _ := parser.ParseFile(gblFset, filename, src, parser.AllErrors)
+	pkg := &ast.Package{
+		Name:  pkgname,
+		Files: map[string]*ast.File{filename: f},
+	}
+	conf := *gblConf
+	conf.NoFileLine = false
+	conf.RelativeBase = "/foo"
+	_, err := cl.NewPackage("", pkg, &conf)
+	if err == nil {
+		t.Fatal("no error?")
+	}
+	if ret := err.Error(); ret != msg {
+		t.Fatalf("\nError: \"%s\"\nExpected: \"%s\"\n", ret, msg)
+	}
+}
+
 func TestErrLambdaExpr(t *testing.T) {
 	codeErrorTest(t,
 		"bar.gop:7:6: too few arguments in lambda expression\n\thave ()\n\twant (int, int)", `
@@ -969,3 +988,10 @@ func TestErrCompileFunc(t *testing.T) {
 printf("%+v\n", int32)
 `)
 }
+
+func TestToTypeError(t *testing.T) {
+	codeErrorTestAst(t, "main", "bar.gop", `bar.gop:3:3: toType unexpected: *ast.BadExpr`, `
+type
+a := 1
+`)
+}
diff --git a/cl/func_type_and_var.go b/cl/func_type_and_var.go
index ca8a37f1a..6d195d2a4 100644
--- a/cl/func_type_and_var.go
+++ b/cl/func_type_and_var.go
@@ -21,7 +21,6 @@ import (
 	"go/types"
 	"log"
 	"math/big"
-	"reflect"
 	"strconv"
 
 	"github.com/goplus/gop/ast"
@@ -179,9 +178,10 @@ func toType(ctx *blockCtx, typ ast.Expr) (t types.Type) {
 		return toIndexType(ctx, v)
 	case *ast.IndexListExpr:
 		return toIndexListType(ctx, v)
+	default:
+		ctx.handleErrorf(v.Pos(), "toType unexpected: %T", v)
+		return types.Typ[types.Invalid]
 	}
-	log.Panicln("toType: unknown -", reflect.TypeOf(typ))
-	return nil
 }
 
 var (