From ad929663a20aba86f58c02d57dc75cf840c50c39 Mon Sep 17 00:00:00 2001
From: xushiwei <x@goplus.org>
Date: Tue, 24 Oct 2023 11:53:50 +0800
Subject: [PATCH] ast: FuncDecl.Shadow

---
 ast/ast.go       |  1 +
 ast/walk.go      | 16 +++++++++-------
 parser/parser.go |  3 ++-
 3 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/ast/ast.go b/ast/ast.go
index dbac1db09..f0b489532 100644
--- a/ast/ast.go
+++ b/ast/ast.go
@@ -1059,6 +1059,7 @@ type (
 		Type     *FuncType     // function signature: parameters, results, and position of "func" keyword
 		Body     *BlockStmt    // function body; or nil for external (non-Go) function
 		Operator bool          // is operator or not
+		Shadow   bool          // is a shadow entry
 	}
 )
 
diff --git a/ast/walk.go b/ast/walk.go
index ba6f4ff18..3cdc64e96 100644
--- a/ast/walk.go
+++ b/ast/walk.go
@@ -345,14 +345,16 @@ func Walk(v Visitor, node Node) {
 		}
 
 	case *FuncDecl:
-		if n.Doc != nil {
-			Walk(v, n.Doc)
-		}
-		if n.Recv != nil {
-			Walk(v, n.Recv)
+		if !n.Shadow { // not a shadow entry
+			if n.Doc != nil {
+				Walk(v, n.Doc)
+			}
+			if n.Recv != nil {
+				Walk(v, n.Recv)
+			}
+			Walk(v, n.Name)
+			Walk(v, n.Type)
 		}
-		Walk(v, n.Name)
-		Walk(v, n.Type)
 		if n.Body != nil {
 			Walk(v, n.Body)
 		}
diff --git a/parser/parser.go b/parser/parser.go
index 43bb6efe8..6a9100d9d 100644
--- a/parser/parser.go
+++ b/parser/parser.go
@@ -3668,7 +3668,8 @@ func (p *parser) parseGlobalStmts(sync map[token.Token]bool, pos token.Pos, stmt
 			Func:   pos,
 			Params: &ast.FieldList{},
 		},
-		Body: &ast.BlockStmt{List: list},
+		Body:   &ast.BlockStmt{List: list},
+		Shadow: true,
 	}
 	p.shadowEntry = f
 	return f