cmd/compile: improve issue62407_test

The original issue62407_test also passes with versions prior to 1.23.
The improvement makes it fail with versions prior to 1.23.

Change-Id: I94bfb9d1ac695c8e07997d7029fc2101535e14f8
GitHub-Last-Rev: 44be2a610a1a79d04dc3d228af2b313200f4d900
GitHub-Pull-Request: golang/go#70938
Reviewed-on: https://go-review.googlesource.com/c/go/+/638036
Reviewed-by: Junyang Shao <shaojunyang@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>

diff --git a/src/cmd/compile/internal/test/issue62407_test.go b/src/cmd/compile/internal/test/issue62407_test.go
index d065673627b3b117cff589859774da93f7a7b61e..fc9e7a5be082612e341e191cd87727327b6bd4d3 100644 (file)
--- a/src/cmd/compile/internal/test/issue62407_test.go
+++ b/src/cmd/compile/internal/test/issue62407_test.go
@@ -10,7 +10,7 @@ import (
 )
 
 //go:noinline
-func foo() string { return "foo" }
+func foo() string { return "foofoofoofoofoofo" } // len == 17
 
 //go:noinline
 func empty() string { return "" }
@@ -23,8 +23,8 @@ func TestConcatBytes(t *testing.T) {
                want []byte
        }{
                "two empty elements":                 {got: []byte(empty + empty), want: []byte{}},
-               "two nonempty elements":              {got: []byte(s + s), want: []byte("foofoo")},
-               "one empty and one nonempty element": {got: []byte(s + empty), want: []byte("foo")},
+               "two nonempty elements":              {got: []byte(s + s), want: append([]byte(foo()), foo()...)},
+               "one empty and one nonempty element": {got: []byte(s + empty), want: []byte(foo())},
                "multiple empty elements":            {got: []byte(empty + empty + empty + empty + empty + empty), want: []byte{}},
                "multiple nonempty elements":         {got: []byte("1" + "2" + "3" + "4" + "5" + "6"), want: []byte("123456")},
        }