internal compiler error: shape types have no methods PTR-*go.shape.struct {}_0 #49538
Description
What version of Go are you using (go version)?
$ go version go version devel go1.18-7bed3c7975 Fri Nov 12 00:16:15 2021 +0000 windows/amd64
What operating system and processor architecture are you using (go env)?
go env Output
$ go env set GO111MODULE=on set GOARCH=amd64 set GOBIN= set GOCACHE= set GOENV= set GOEXE=.exe set GOEXPERIMENT= set GOFLAGS= set GOHOSTARCH=amd64 set GOHOSTOS=windows set GOINSECURE= set GOMODCACHE= set GONOPROXY= set GONOSUMDB= set CC=gcc set CXX=g++ set CGO_ENABLED=1 set GOMOD= set GOWORK= set CGO_CFLAGS=-g -O2 set CGO_CPPFLAGS= set CGO_CXXFLAGS=-g -O2 set CGO_FFLAGS=-g -O2 set CGO_LDFLAGS=-g -O2 set PKG_CONFIG=pkg-config set GOGCCFLAGS=-m64 -mthreads -fmessage-length=0 -fdebug-prefix-map=\AppData\Local\Temp\go-build3365534766=/tmp/go-build -gno-record-gcc-switches
What did you do?
package main
type IA interface {
Test(interface{})
}
type A[T any] struct{}
func (a A[T]) Test(in interface{}) {}
func Handle[T IA](in *T) {
(*in).Test(in) // internal compiler error
//(*in).Test(interface{}(in)) // ok
}
func main() {
a := &A[int]{}
Handle(a)
}
What did you see instead?
.\main.go:17:9: internal compiler error: shape types have no methods PTR-*go.shape.struct {}_0
goroutine 1 [running]:
runtime/debug.Stack()
C:/Users/xxxxxxx/sdk/gotip/src/runtime/debug/stack.go:24 +0x65
cmd/compile/internal/base.FatalfAt({0xca29e0?, 0x0?}, {0xd4e7f5, 0x1f}, {0xc00041f2f8, 0x1, 0x1})
C:/Users/xxxxxxx/sdk/gotip/src/cmd/compile/internal/base/print.go:227 +0x1ca
cmd/compile/internal/base.Fatalf(...)
C:/Users/xxxxxxx/sdk/gotip/src/cmd/compile/internal/base/print.go:196
cmd/compile/internal/reflectdata.MarkTypeUsedInInterface(0xc000428c40, 0xc00043a780)
C:/Users/xxxxxxx/sdk/gotip/src/cmd/compile/internal/reflectdata/reflect.go:1973 +0x6f
cmd/compile/internal/walk.walkConvInterface(0xc00042f720, 0xc00041fa70)
C:/Users/xxxxxxx/sdk/gotip/src/cmd/compile/internal/walk/convert.go:49 +0x107
cmd/compile/internal/walk.walkExpr1({0xeb1630, 0xc00042f720}, 0xc00042f720?)
C:/Users/xxxxxxx/sdk/gotip/src/cmd/compile/internal/walk/expr.go:211 +0x57f
cmd/compile/internal/walk.walkExpr({0xeb1630, 0xc00042f720}, 0xc00041fa70)
C:/Users/xxxxxxx/sdk/gotip/src/cmd/compile/internal/walk/expr.go:55 +0x428
cmd/compile/internal/walk.walkExprList(...)
C:/Users/xxxxxxx/sdk/gotip/src/cmd/compile/internal/walk/expr.go:335
cmd/compile/internal/walk.walkCall1(0xc000414990, 0xc00041fa70)
C:/Users/xxxxxxx/sdk/gotip/src/cmd/compile/internal/walk/expr.go:571 +0x169
cmd/compile/internal/walk.walkCall(0xc000414990, 0xeb0cd0?)
C:/Users/xxxxxxx/sdk/gotip/src/cmd/compile/internal/walk/expr.go:553 +0x6ac
cmd/compile/internal/walk.walkExpr1({0xeb10b8, 0xc000414990}, 0xc000414990?)
C:/Users/xxxxxxx/sdk/gotip/src/cmd/compile/internal/walk/expr.go:176 +0x485
cmd/compile/internal/walk.walkExpr({0xeb10b8, 0xc000414990}, 0xc00041fa70)
C:/Users/xxxxxxx/sdk/gotip/src/cmd/compile/internal/walk/expr.go:55 +0x428
cmd/compile/internal/walk.walkStmt({0xeb10b8, 0xc000414990?})
C:/Users/xxxxxxx/sdk/gotip/src/cmd/compile/internal/walk/stmt.go:57 +0x7da
cmd/compile/internal/walk.walkStmtList(...)
C:/Users/xxxxxxx/sdk/gotip/src/cmd/compile/internal/walk/stmt.go:175
cmd/compile/internal/walk.Walk(0xc000408840)
C:/Users/xxxxxxx/sdk/gotip/src/cmd/compile/internal/walk/walk.go:43 +0x151
cmd/compile/internal/gc.prepareFunc(0xc000408840)
C:/Users/xxxxxxx/sdk/gotip/src/cmd/compile/internal/gc/compile.go:92 +0x6d
cmd/compile/internal/gc.enqueueFunc(0xc000408840)
C:/Users/xxxxxxx/sdk/gotip/src/cmd/compile/internal/gc/compile.go:66 +0x2fd
cmd/compile/internal/gc.Main(0xd68cf0)
C:/Users/xxxxxxx/sdk/gotip/src/cmd/compile/internal/gc/main.go:309 +0xf97
main.main()
C:/Users/xxxxxxx/sdk/gotip/src/cmd/compile/main.go:55 +0xdd
Compilation finished with exit code 2