cmd/compile: internal compiler error: not lowered: v46, Load ARRAY PTR64 SSA #26120
Description
$ gotip version
go version devel +c07f2b0099 Thu Jun 28 17:46:02 2018 +0000 linux/amd64
The following program (reduced from a gosmith-generated one):
package p
type T [1]struct {
f []int
i, j int
}
func F() {
var v T
f := func() T {
return v
}
_ = []int{}[f()[0].i]
}
crashes the tip compiler with the following error:
$ gotip build crash.go
# command-line-arguments
./crash.go:13:18: internal compiler error: not lowered: v46, Load ARRAY PTR64 SSA
goroutine 8 [running]:
runtime/debug.Stack(0x0, 0x0, 0x0)
/home/alberto/go/src/runtime/debug/stack.go:24 +0xa7
cmd/compile/internal/gc.Fatalf(0xca3be5, 0x2, 0xc0004fc0e0, 0x1, 0x1)
/home/alberto/go/src/cmd/compile/internal/gc/subr.go:182 +0x1f7
cmd/compile/internal/gc.(*ssafn).Fatalf(0xc0004c8000, 0xd12000000002, 0xca3be5, 0x2, 0xc0004fc0e0, 0x1, 0x1)
/home/alberto/go/src/cmd/compile/internal/gc/ssa.go:5583 +0x67
cmd/compile/internal/ssa.(*Func).Fatalf(0xc0004cc000, 0xca3be5, 0x2, 0xc0004fc0e0, 0x1, 0x1)
/home/alberto/go/src/cmd/compile/internal/ssa/func.go:562 +0x73
cmd/compile/internal/ssa.checkLower(0xc0004cc000)
/home/alberto/go/src/cmd/compile/internal/ssa/lower.go:36 +0x34d
cmd/compile/internal/ssa.Compile(0xc0004cc000)
/home/alberto/go/src/cmd/compile/internal/ssa/compile.go:70 +0x30e
cmd/compile/internal/gc.buildssa(0xc00035e000, 0x1, 0x0)
/home/alberto/go/src/cmd/compile/internal/gc/ssa.go:211 +0xaa7
cmd/compile/internal/gc.compileSSA(0xc00035e000, 0x1)
/home/alberto/go/src/cmd/compile/internal/gc/pgen.go:259 +0x39
cmd/compile/internal/gc.compileFunctions.func2(0xc0004bab40, 0xc0000166c0, 0x1)
/home/alberto/go/src/cmd/compile/internal/gc/pgen.go:323 +0x49
created by cmd/compile/internal/gc.compileFunctions
/home/alberto/go/src/cmd/compile/internal/gc/pgen.go:321 +0x11a
It compiles fine on go1.10.