diff --git a/.github/codecov.yml b/.github/codecov.yml
new file mode 100644
index 0000000..6e1dfdf
--- /dev/null
+++ b/.github/codecov.yml
@@ -0,0 +1,3 @@
+coverage:
+  ignore:
+    - "modfetch"
diff --git a/README.md b/README.md
index 6f660ad..e6e41d2 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,6 @@ mod - Module support for Go/XGo
 =====
 
 [![Build Status](https://github.com/goplus/mod/actions/workflows/go.yml/badge.svg)](https://github.com/goplus/mod/actions/workflows/go.yml)
-[![Go Report Card](https://goreportcard.com/badge/github.com/goplus/mod)](https://goreportcard.com/report/github.com/goplus/mod)
 [![GitHub release](https://img.shields.io/github/v/tag/goplus/mod.svg?label=release)](https://github.com/goplus/mod/releases)
 [![Coverage Status](https://codecov.io/gh/goplus/mod/branch/main/graph/badge.svg)](https://codecov.io/gh/goplus/mod)
 [![GoDoc](https://pkg.go.dev/badge/github.com/goplus/mod.svg)](https://pkg.go.dev/github.com/goplus/mod)
diff --git a/modfile/rule.go b/modfile/rule.go
index ff3694f..9cc6897 100644
--- a/modfile/rule.go
+++ b/modfile/rule.go
@@ -91,8 +91,15 @@ type Project struct {
 	PkgPaths []string  // package paths of classfile and optional inline-imported packages.
 	Import   []*Import // auto-imported packages
 	Pack     *Pack     // pack directive (at most one per project)
-	Flat     bool      // if true, all matching files are fragments of the project class (no work classfiles)
-	Syntax   *Line
+
+	// AutoLambdas maps command => number of parameters before auto lambda.
+	// See https://github.com/goplus/xgo/issues/2828.
+	AutoLambdas map[string]int
+
+	// if Flat is true, all matching files are fragments of the project class (no work classfiles).
+	Flat bool
+
+	Syntax *Line
 }
 
 // IsProj checks if a (ext, fname) pair is a project file or not.
diff --git a/xgomod/classfile.go b/xgomod/classfile.go
index 438d6f2..4d6f0f0 100644
--- a/xgomod/classfile.go
+++ b/xgomod/classfile.go
@@ -59,10 +59,20 @@ func IsNotFound(err error) bool {
 
 // ClassKind checks a fname is a known classfile or not.
 // If it is, then it checks the fname is a project file or not.
+//
+// Deprecated: use ClassInfo instead.
 func (p *Module) ClassKind(fname string) (isProj, ok bool) {
+	_, isProj, ok = p.ClassInfo(fname)
+	return
+}
+
+// ClassInfo checks a fname is a known classfile or not.
+// If it is, it returns the auto-lambda map, whether it is a project file, and true.
+// See https://github.com/goplus/xgo/issues/2828 to learn about auto lambda.
+func (p *Module) ClassInfo(fname string) (autoLambdas map[string]int, isProj, ok bool) {
 	ext := modfile.ClassExt(fname)
 	if c, ok := p.projs[ext]; ok {
-		return c.IsProj(ext, fname), true
+		return c.AutoLambdas, c.IsProj(ext, fname), true
 	}
 	return
 }
diff --git a/xgomod/xgomod_test.go b/xgomod/xgomod_test.go
index 897cea6..d6e20e5 100644
--- a/xgomod/xgomod_test.go
+++ b/xgomod/xgomod_test.go
@@ -150,8 +150,8 @@ func TestClassfile2(t *testing.T) {
 	if err := mod.ImportClasses(func(c *Project) {}); err != nil {
 		t.Fatal("mod.ImportClasses:", err)
 	}
-	if isProj, ok := mod.ClassKind("foo_yap.gox"); !ok || !isProj {
-		t.Fatal("mod.ClassKind foo_yap.gox:", isProj, ok)
+	if _, isProj, ok := mod.ClassInfo("foo_yap.gox"); !ok || !isProj {
+		t.Fatal("mod.ClassInfo foo_yap.gox:", isProj, ok)
 	}
 	if _, ok := mod.ClassKind("foo.gox"); ok {
 		t.Fatal("mod.ClassKind foo.gox: ok?")