[pull] master from golang:master

src/cmd/compile/internal/ir/func.go

@@ -13,7 +13,6 @@ import (
 	"cmd/internal/src"
 	"encoding/base64"
 	"fmt"
-	"io"
 	"unicode/utf8"
 )
 
@@ -472,9 +471,11 @@ func closureName(outerfn *Func, pos src.XPos, why Op, gen int) *types.Sym {
 		// we use a content hash to disambiguate instead.
 		// We choose the suffix as a hash of the inline call stack.
 		h := hash.New32()
-		io.WriteString(h, outer)
+		fmt.Fprint(h, inlIndex)
 		base.Ctxt.InlTree.AllParents(inlIndex, func(call obj.InlinedCall) {
-			io.WriteString(h, call.Name+":"+call.Pos.LineNumber()+":"+call.Pos.ColumnNumber())
+			if call.Parent >= 0 {
+				fmt.Fprint(h, " ", call.Parent)
+			}
 		})
 		inlHash = base64.StdEncoding.EncodeToString(h.Sum(nil)[:8])
 

src/cmd/internal/obj/plist.go

@@ -183,7 +183,11 @@ func (ctxt *Link) InitTextSym(s *LSym, flag int, start src.XPos) {
 		return
 	}
 	if s.Func() != nil {
-		ctxt.Diag("%s: symbol %s redeclared\n\t%s: other declaration of symbol %s", ctxt.PosTable.Pos(start), s.Name, ctxt.PosTable.Pos(s.Func().Text.Pos), s.Name)
+		otherPos := src.NoPos
+		if s.Func().Text != nil {
+			otherPos = ctxt.PosTable.Pos(s.Func().Text.Pos)
+		}
+		ctxt.Diag("%s: symbol %s redeclared\n\t%s: other declaration of symbol %s", ctxt.PosTable.Pos(start), s.Name, otherPos, s.Name)
 		return
 	}
 	s.NewFuncInfo()

test/fixedbugs/issue79274.go

@@ -0,0 +1,25 @@
+// compile
+
+// Copyright 2026 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import "math/big"
+
+func F() {
+	var pg0_0 *int
+	_ = pg0_0
+	var u16_0 uint16
+	fnc := func(a [0][][3]int, b [14][9]uint16, c []big.Int) uint16 {
+		pg0_0 = func() *int { return nil }()
+		return 0
+	}
+
+	fnc([0][][3]int{}, [14][9]uint16{[9]uint16{fnc([0][][3]int{}, [14][9]uint16{[9]uint16{min(fnc([0][][3]int{}, [14][9]uint16{[9]uint16{(uint16)(16), (uint16)(93), (uint16)(31)}, [9]uint16{(uint16)(5), (uint16)(69)}, [9]uint16{}}, []big.Int{}), u16_0), fnc([0][][3]int{}, [14][9]uint16{}, nil)}, [9]uint16{fnc([0][][3]int{}, [14][9]uint16{}, nil)}, [9]uint16{}}, nil), 0}}, nil)
+}
+
+func main() {
+	F()
+}

test/fixedbugs/issue79274a.dir/a.go

@@ -0,0 +1,6 @@
+// Copyright 2026 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package p
+var _ = F(); func F() func() { return func() {} }

test/fixedbugs/issue79274a.dir/b.go

@@ -0,0 +1,6 @@
+// Copyright 2026 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package p
+var _ = F()

test/fixedbugs/issue79274a.go

@@ -0,0 +1,7 @@
+// compiledir
+
+// Copyright 2026 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ignored