diff --git a/src/cmd/compile/internal/walk/convert.go b/src/cmd/compile/internal/walk/convert.go index c67a29fc09..bf06ed6f46 100644 --- a/src/cmd/compile/internal/walk/convert.go +++ b/src/cmd/compile/internal/walk/convert.go @@ -80,13 +80,15 @@ func walkConvInterface(n *ir.ConvExpr, init *ir.Nodes) ir.Node { var typeWord ir.Node if toType.IsEmptyInterface() { - // Implement interface to empty interface conversion. - // res = itab + // Implement interface to empty interface conversion: + // + // var res *uint8 + // res = (*uint8)(unsafe.Pointer(itab)) // if res != nil { // res = res.type // } typeWord = typecheck.Temp(types.NewPtr(types.Types[types.TUINT8])) - init.Append(ir.NewAssignStmt(base.Pos, typeWord, itab)) + init.Append(ir.NewAssignStmt(base.Pos, typeWord, typecheck.Conv(typecheck.Conv(itab, types.Types[types.TUNSAFEPTR]), typeWord.Type()))) nif := ir.NewIfStmt(base.Pos, typecheck.Expr(ir.NewBinaryExpr(base.Pos, ir.ONE, typeWord, typecheck.NodNil())), nil, nil) nif.Body = []ir.Node{ir.NewAssignStmt(base.Pos, typeWord, itabType(typeWord))} init.Append(nif) diff --git a/test/fixedbugs/issue56768.go b/test/fixedbugs/issue56768.go new file mode 100644 index 0000000000..1b2db4cceb --- /dev/null +++ b/test/fixedbugs/issue56768.go @@ -0,0 +1,37 @@ +// compile + +// Copyright 2022 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 + +type I interface { + M() +} + +type slice []any + +func f() { + ss := struct{ i I }{} + + _ = [...]struct { + s slice + }{ + { + s: slice{ss.i}, + }, + { + s: slice{ss.i}, + }, + { + s: slice{ss.i}, + }, + { + s: slice{ss.i}, + }, + { + s: slice{ss.i}, + }, + } +}