diff --git a/.gitignore b/.gitignore
index 3d29051e..7c0b0d92 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,6 +15,7 @@ stories*.bin
 .DS_Store
 err.log
 numpy.txt
+result.txt
 
 _go/
 _runtime/
diff --git a/cl/cltest/cltest.go b/cl/cltest/cltest.go
index 1b6a82e4..25cc9bea 100644
--- a/cl/cltest/cltest.go
+++ b/cl/cltest/cltest.go
@@ -18,6 +18,7 @@ package cltest
 
 import (
 	"archive/zip"
+	"bytes"
 	"go/ast"
 	"go/parser"
 	"go/token"
@@ -35,6 +36,7 @@ import (
 	"github.com/goplus/llgo/cl"
 	"github.com/goplus/llgo/internal/llgen"
 	"github.com/goplus/llgo/ssa/ssatest"
+	"github.com/qiniu/x/test"
 	"golang.org/x/tools/go/ssa"
 	"golang.org/x/tools/go/ssa/ssautil"
 
@@ -112,14 +114,13 @@ func testFrom(t *testing.T, pkgDir, sel string) {
 		return
 	}
 	log.Println("Parsing", pkgDir)
+	v := llgen.GenFrom(pkgDir)
 	out := pkgDir + "/out.ll"
-	b, err := os.ReadFile(out)
-	if err != nil {
-		t.Fatal("ReadFile failed:", err)
-	}
-	expected := string(b)
-	if v := llgen.GenFrom(pkgDir); v != expected && expected != ";" { // expected == ";" means skipping out.ll
-		t.Fatalf("\n==> got:\n%s\n==> expected:\n%s\n", v, expected)
+	b, _ := os.ReadFile(out)
+	if !bytes.Equal(b, []byte{';'}) { // expected == ";" means skipping out.ll
+		if test.Diff(t, pkgDir+"/result.txt", []byte(v), b) {
+			t.Fatal("llgen.GenFrom: unexpect result")
+		}
 	}
 }
 
diff --git a/cl/compile.go b/cl/compile.go
index 8e9434eb..e8c3fdcb 100644
--- a/cl/compile.go
+++ b/cl/compile.go
@@ -213,15 +213,8 @@ func isCgoVar(name string) bool {
 }
 
 func (p *context) compileFuncDecl(pkg llssa.Package, f *ssa.Function) (llssa.Function, llssa.PyObjRef, int) {
-	pkgTypes, name, ftype := p.funcName(f, true)
+	pkgTypes, name, ftype := p.funcName(f)
 	if ftype != goFunc {
-		/*
-			if ftype == pyFunc {
-				// TODO(xsw): pyMod == ""
-				fnName := pysymPrefix + p.pyMod + "." + name
-				return nil, pkg.NewPyFunc(fnName, f.Signature, call), pyFunc
-			}
-		*/
 		return nil, nil, ignoredFunc
 	}
 	sig := f.Signature
diff --git a/cl/import.go b/cl/import.go
index f5e48c0b..be3cc8c3 100644
--- a/cl/import.go
+++ b/cl/import.go
@@ -497,7 +497,7 @@ const (
 	llgoAtomicOpLast = llgoAtomicOpBase + int(llssa.OpUMin)
 )
 
-func (p *context) funcName(fn *ssa.Function, ignore bool) (*types.Package, string, int) {
+func (p *context) funcName(fn *ssa.Function) (*types.Package, string, int) {
 	var pkg *types.Package
 	var orgName string
 	if origin := fn.Origin(); origin != nil {
diff --git a/cl/instr.go b/cl/instr.go
index aebc8968..47a93df7 100644
--- a/cl/instr.go
+++ b/cl/instr.go
@@ -334,7 +334,7 @@ var llgoInstrs = map[string]int{
 // funcOf returns a function by name and set ftype = goFunc, cFunc, etc.
 // or returns nil and set ftype = llgoCstr, llgoAlloca, llgoUnreachable, etc.
 func (p *context) funcOf(fn *ssa.Function) (aFn llssa.Function, pyFn llssa.PyObjRef, ftype int) {
-	pkgTypes, name, ftype := p.funcName(fn, false)
+	pkgTypes, name, ftype := p.funcName(fn)
 	switch ftype {
 	case pyFunc:
 		if kind, mod := pkgKindByScope(pkgTypes.Scope()); kind == PkgPyModule {