types2, go/types: panic when using reflect.TypeOf in unexported struct

[qmuntal]

What version of Go are you using (go version)?

go version devel go1.18-ad97d204f0 Sun Sep 12 16:46:58 2021 +0000 windows/amd64

Does this issue reproduce with the latest release?

Only in tip

What operating system and processor architecture are you using (go env)?

go env Output

set GO111MODULE=
set GOARCH=amd64
set GOBIN=
set GOCACHE=C:\Users\muntal\AppData\Local\go-build
set GOENV=C:\Users\muntal\AppData\Roaming\go\env
set GOEXE=.exe
set GOEXPERIMENT=
set GOFLAGS=
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOINSECURE=
set GOMODCACHE=C:\Users\muntal\go\pkg\mod
set GONOPROXY=
set GONOSUMDB=
set GOOS=windows
set GOPATH=C:\Users\muntal\go
set GOPRIVATE=
set GOPROXY=https://proxy.golang.org,direct
set GOROOT=C:\Users\muntal\sdk\gotip
set GOSUMDB=sum.golang.org
set GOTMPDIR=
set GOTOOLDIR=C:\Users\muntal\sdk\gotip\pkg\tool\windows_amd64      
set GOVCS=
set GOVERSION=devel go1.18-ad97d204f0 Sun Sep 12 16:46:58 2021 +0000
set GCCGO=gccgo
set AR=ar
set CC=gcc
set CXX=g++
set CGO_ENABLED=1
set GOMOD=C:\_\funcalias\go.mod
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=C:\Users\muntal\AppData\Local\Temp\go-build3333664198=/tmp/go-build -gno-record-gcc-switches 

What did you do?

--- p.go

package p

import "reflect"

type foo[T any] struct {}

func (foo[_]) Call() bool {
  return reflect.TypeOf(0) != nil
}

type P0[T any] struct {
  foo foo[T]
}

--- example_test.go

package p_test

import "p"

func Example() {
  var _ = p.P0[string]{}
}

Execute go test example_test.go

What did you expect to see?

No panic

What did you see instead?

# p_test [p.test]
.\main.go:9:23: internal compiler error: missing import reader for reflect.TypeOf

goroutine 1 [running]:
runtime/debug.Stack()
        C:/Users/muntal/sdk/gotip/src/runtime/debug/stack.go:24 +0x65
cmd/compile/internal/base.FatalfAt({0x6, 0x0}, {0x181aff1, 0x1c}, {0xc0000dd170, 0x1, 0x1})
        C:/Users/muntal/sdk/gotip/src/cmd/compile/internal/base/print.go:227 +0x154
cmd/compile/internal/base.Fatalf(...)
        C:/Users/muntal/sdk/gotip/src/cmd/compile/internal/base/print.go:196
cmd/compile/internal/typecheck.ImportBody(0xc000646dc0)
        C:/Users/muntal/sdk/gotip/src/cmd/compile/internal/typecheck/iimport.go:73 +0x1b9
cmd/compile/internal/typecheck.ImportedBody(0xc000646dc0)
        C:/Users/muntal/sdk/gotip/src/cmd/compile/internal/typecheck/func.go:169 +0xad
cmd/compile/internal/inline.oldInline(0xc000624630, 0xc000646dc0, 0x0)
        C:/Users/muntal/sdk/gotip/src/cmd/compile/internal/inline/inl.go:782 +0x53
cmd/compile/internal/inline.mkinlcall(0xc000624630, 0xc000646dc0, 0x8, 0xc00002c870, 0x0)
        C:/Users/muntal/sdk/gotip/src/cmd/compile/internal/inline/inl.go:734 +0xc85
cmd/compile/internal/inline.inlnode({0x19852d8, 0xc000624630}, 0xdd7e8, 0x10d30bf, 0x40)
        C:/Users/muntal/sdk/gotip/src/cmd/compile/internal/inline/inl.go:591 +0x45d
cmd/compile/internal/inline.InlineCalls.func1({0x19852d8, 0xc000624630})
        C:/Users/muntal/sdk/gotip/src/cmd/compile/internal/inline/inl.go:513 +0x31
cmd/compile/internal/ir.(*BinaryExpr).editChildren(0xc000404b40, 0xc00005e840)
        C:/Users/muntal/sdk/gotip/src/cmd/compile/internal/ir/node_gen.go:204 +0x58
cmd/compile/internal/ir.EditChildren(...)
        C:/Users/muntal/sdk/gotip/src/cmd/compile/internal/ir/visit.go:185
cmd/compile/internal/inline.inlnode({0x1985080, 0xc000404b40}, 0xdd8f8, 0x10c4de2, 0x1986980)
        C:/Users/muntal/sdk/gotip/src/cmd/compile/internal/inline/inl.go:570 +0x311
cmd/compile/internal/inline.InlineCalls.func1({0x1985080, 0xc000404b40})
        C:/Users/muntal/sdk/gotip/src/cmd/compile/internal/inline/inl.go:513 +0x31
cmd/compile/internal/ir.editNodes({0xc000408c10, 0x1, 0xc000649c20}, 0xc00005e840)
        C:/Users/muntal/sdk/gotip/src/cmd/compile/internal/ir/node_gen.go:1521 +0x74
cmd/compile/internal/ir.(*ReturnStmt).editChildren(0xc000649c20, 0xc000649c20)
        C:/Users/muntal/sdk/gotip/src/cmd/compile/internal/ir/node_gen.go:1056 +0x53
cmd/compile/internal/ir.EditChildren(...)
        C:/Users/muntal/sdk/gotip/src/cmd/compile/internal/ir/visit.go:185
cmd/compile/internal/inline.inlnode({0x1986e30, 0xc000649c20}, 0x20, 0x30, 0x209c0ea0108)
        C:/Users/muntal/sdk/gotip/src/cmd/compile/internal/inline/inl.go:570 +0x311
cmd/compile/internal/inline.InlineCalls.func1({0x1986e30, 0xc000649c20})
        C:/Users/muntal/sdk/gotip/src/cmd/compile/internal/inline/inl.go:513 +0x31
cmd/compile/internal/ir.editNodes({0xc000408c00, 0x1, 0x2030000}, 0xc00005e840)
        C:/Users/muntal/sdk/gotip/src/cmd/compile/internal/ir/node_gen.go:1521 +0x74
cmd/compile/internal/ir.(*Func).editChildren(0xc0000ddad8, 0x10cfb87)
        C:/Users/muntal/sdk/gotip/src/cmd/compile/internal/ir/func.go:153 +0x2e
cmd/compile/internal/ir.EditChildren(...)
        C:/Users/muntal/sdk/gotip/src/cmd/compile/internal/ir/visit.go:185
cmd/compile/internal/inline.InlineCalls(0xc000646f20)
        C:/Users/muntal/sdk/gotip/src/cmd/compile/internal/inline/inl.go:515 +0xf2
cmd/compile/internal/inline.InlinePackage.func1({0xc000006148, 0x1, 0xc000646f20}, 0x0)
        C:/Users/muntal/sdk/gotip/src/cmd/compile/internal/inline/inl.go:71 +0x46
cmd/compile/internal/ir.(*bottomUpVisitor).visit(0xc00002c750, 0xc000646f20)
        C:/Users/muntal/sdk/gotip/src/cmd/compile/internal/ir/scc.go:127 +0x2f0
cmd/compile/internal/ir.VisitFuncsBottomUp({0xc00062bac0, 0x2, 0xb}, 0x1837e40)
        C:/Users/muntal/sdk/gotip/src/cmd/compile/internal/ir/scc.go:60 +0x105
cmd/compile/internal/inline.InlinePackage()
        C:/Users/muntal/sdk/gotip/src/cmd/compile/internal/inline/inl.go:58 +0x33
cmd/compile/internal/gc.Main(0x1837cf8)
        C:/Users/muntal/sdk/gotip/src/cmd/compile/internal/gc/main.go:246 +0xc7d
main.main()
        C:/Users/muntal/sdk/gotip/src/cmd/compile/main.go:55 +0xdd

FAIL    p [build failed]
FAIL

@griesemer

[qmuntal]

Additional note: The panic does not happen if foo is exported.

[cuonglm]

Seems duplicated of #48337

[qmuntal]

Seems duplicated of #48337

Good catch, it is indeed duplicated.