test: delete sliceopt.go

It tests the behavior of the old deleted compiler.

Fixes #17362.

Change-Id: Ia2fdec734c5cbe724a9de562ed71598f67244ab3
Reviewed-on: https://go-review.googlesource.com/30593Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

test/sliceopt.go

-// +build !amd64,!arm,!amd64p32,!386,!arm64,!ppc64le,!mips64,!mips64le,!s390x
-// errorcheck -0 -d=append,slice
-
-// Copyright 2015 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.
-
-// Check optimization results for append and slicing.
-
-package main
-
-func a1(x []int, y int) []int {
-	x = append(x, y) // ERROR "append: len-only update"
-	return x
-}
-
-func a2(x []int, y int) []int {
-	return append(x, y) // ERROR "append: full update"
-}
-
-func a3(x *[]int, y int) {
-	*x = append(*x, y) // ERROR "append: len-only update"
-}
-
-func s1(x **[]int, xs **string, i, j int) {
-	var z []int
-	z = (**x)[2:]         // ERROR "slice: omit check for 2nd index"
-	z = (**x)[2:len(**x)] // not yet: "slice: reuse len" "slice: omit check for 2nd index"
-	z = (**x)[2:cap(**x)] // not yet: "slice: reuse cap" "slice: omit check for 2nd index"
-	z = (**x)[i:i]        // ERROR "slice: reuse 1st index" "slice: omit check for 1st index" "slice: result len == 0"
-	z = (**x)[1:i:i]      // ERROR "slice: reuse 2nd index" "slice: omit check for 2nd index" "slice: result cap == result len"
-	z = (**x)[i:j:0]      // ERROR "slice: omit check for 3rd index"
-	z = (**x)[i:0:j]      // ERROR "slice: omit check for 2nd index"
-	z = (**x)[0:i:j]      // ERROR "slice: omit check for 1st index" "slice: skip base adjustment for 1st index 0"
-	z = (**x)[0:]         // ERROR "slice: omit slice operation"
-	z = (**x)[2:8]        // ERROR "slice: omit check for 1st index" "slice: result len == 6"
-	z = (**x)[2:2]        // ERROR "slice: omit check for 1st index" "slice: result len == 0"
-	z = (**x)[0:i]        // ERROR "slice: omit check for 1st index" "slice: skip base adjustment for 1st index 0"
-	z = (**x)[2:i:8]      // ERROR "slice: result cap == 6"
-	z = (**x)[i:2:i]      // ERROR "slice: reuse 1st index" "slice: result cap == 0" "slice: skip base adjustment for cap == 0"
-
-	z = z[0:i]       // ERROR "slice: omit check for 1st index" "slice: result cap not computed" "slice: skip base adjustment for 1st index 0" "slice: len-only update"
-	z = z[0:i : i+1] // ERROR "slice: omit check for 1st index" "slice: skip base adjustment for 1st index 0" "slice: len/cap-only update"
-	z = z[i : i+1]
-
-	println(z)
-
-	var zs string
-	zs = (**xs)[2:]          // ERROR "slice: omit check for 2nd index"
-	zs = (**xs)[2:len(**xs)] // not yet: "slice: reuse len" "slice: omit check for 2nd index"
-	zs = (**xs)[i:i]         // ERROR "slice: reuse 1st index" "slice: omit check for 1st index" "slice: result len == 0" "slice: skip base adjustment for string len == 0"
-	zs = (**xs)[0:]          // ERROR "slice: omit slice operation"
-	zs = (**xs)[2:8]         // ERROR "slice: omit check for 1st index" "slice: result len == 6"
-	zs = (**xs)[2:2]         // ERROR "slice: omit check for 1st index" "slice: result len == 0" "slice: skip base adjustment for string len == 0"
-	zs = (**xs)[0:i]         // ERROR "slice: omit check for 1st index" "slice: skip base adjustment for 1st index 0"
-
-	zs = zs[0:i] // ERROR "slice: omit check for 1st index" "slice: skip base adjustment for 1st index 0" "slice: len-only update"
-	zs = zs[i : i+1]
-	println(zs)
-}