From c586319978459e363984f9ae14c1c4353f9406b3 Mon Sep 17 00:00:00 2001
From: xushiwei <x@goplus.org>
Date: Wed, 19 Jun 2024 12:30:38 +0800
Subject: [PATCH] typepatch fix: don't change patch pkg

---
 internal/lib/errors/errors.go | 51 +++++++++++++++++++++++++++++++++++
 internal/typepatch/patch.go   | 29 +++++++++++++++++++-
 2 files changed, 79 insertions(+), 1 deletion(-)

diff --git a/internal/lib/errors/errors.go b/internal/lib/errors/errors.go
index 465fac108..5f95bdef3 100644
--- a/internal/lib/errors/errors.go
+++ b/internal/lib/errors/errors.go
@@ -15,3 +15,54 @@
  */
 
 package errors
+
+// llgo:skipall
+import (
+	_ "unsafe"
+)
+
+// Unwrap returns the result of calling the Unwrap method on err, if err's
+// type contains an Unwrap method returning error.
+// Otherwise, Unwrap returns nil.
+//
+// Unwrap only calls a method of the form "Unwrap() error".
+// In particular Unwrap does not unwrap errors returned by [Join].
+func Unwrap(err error) error {
+	u, ok := err.(interface {
+		Unwrap() error
+	})
+	if !ok {
+		return nil
+	}
+	return u.Unwrap()
+}
+
+// New returns an error that formats as the given text.
+// Each call to New returns a distinct error value even if the text is identical.
+func New(text string) error {
+	return &errorString{text}
+}
+
+// errorString is a trivial implementation of error.
+type errorString struct {
+	s string
+}
+
+func (e *errorString) Error() string {
+	return e.s
+}
+
+// ErrUnsupported indicates that a requested operation cannot be performed,
+// because it is unsupported. For example, a call to [os.Link] when using a
+// file system that does not support hard links.
+//
+// Functions and methods should not return this error but should instead
+// return an error including appropriate context that satisfies
+//
+//	errors.Is(err, errors.ErrUnsupported)
+//
+// either by directly wrapping ErrUnsupported or by implementing an Is method.
+//
+// Functions and methods should document the cases in which an error
+// wrapping this will be returned.
+var ErrUnsupported = New("unsupported operation")
diff --git a/internal/typepatch/patch.go b/internal/typepatch/patch.go
index 48feb73b9..e6f42e9af 100644
--- a/internal/typepatch/patch.go
+++ b/internal/typepatch/patch.go
@@ -43,6 +43,7 @@ type typesScope struct {
 	isFunc   bool
 }
 
+/*
 type object struct {
 	parent *types.Scope
 	pos    token.Pos
@@ -54,6 +55,7 @@ type iface struct {
 	tab  unsafe.Pointer
 	data unsafe.Pointer
 }
+*/
 
 const (
 	tagPatched = 0x17
@@ -77,11 +79,24 @@ func setScope(pkg *types.Package, scope *types.Scope) {
 	p.scope = scope
 }
 
+/*
+func setPath(pkg *types.Package, path string) {
+	p := (*typesPackage)(unsafe.Pointer(pkg))
+	p.path = path
+}
+
+/*
+func setPkg(o types.Object, pkg *types.Package) {
+	data := (*iface)(unsafe.Pointer(&o)).data
+	(*object)(data).pkg = pkg
+}
+
 func setPkgAndParent(o types.Object, pkg *types.Package, parent *types.Scope) {
 	data := (*iface)(unsafe.Pointer(&o)).data
 	(*object)(data).pkg = pkg
 	(*object)(data).parent = parent
 }
+*/
 
 func getElems(scope *types.Scope) map[string]types.Object {
 	s := (*typesScope)(unsafe.Pointer(scope))
@@ -105,11 +120,23 @@ func Pkg(pkg, alt *types.Package) *types.Package {
 
 	altScope := alt.Scope()
 	for name, o := range getElems(altScope) {
-		setPkgAndParent(o, &ret, &scope)
+		/*
+			switch o := o.(type) {
+			case *types.TypeName:
+				if t, ok := o.Type().(*types.Named); ok {
+					for i, n := 0, t.NumMethods(); i < n; i++ {
+						m := t.Method(i)
+						setPkg(m, &ret)
+					}
+				}
+			}
+			setPkgAndParent(o, &ret, &scope)
+		*/
 		elems[name] = o
 	}
 	setElems(&scope, elems)
 	setScope(&ret, &scope)
 	setPatched(pkg)
+	// setPath(alt, ret.Path())
 	return &ret
 }