TBR: fix the build after accidentially pushing https://vanadium.googlesource.com/release.go.core/+/ceef8f9b7a428dd15045ece2a639b5f12ce92520
to the master!!!!

Change-Id: I6827c1a1fecb0e13294f39fb1b63028c804b0b5a
diff --git a/lib/testutil/v23tests/v23tests.go b/lib/testutil/v23tests/v23tests.go
index 6f0f5d7..246b514 100644
--- a/lib/testutil/v23tests/v23tests.go
+++ b/lib/testutil/v23tests/v23tests.go
@@ -657,7 +657,7 @@
 	if len(e.cachedBinDir) > 0 {
 		writeStringOrDie(e, file, fmt.Sprintf("Binaries are cached in %q\n", e.cachedBinDir))
 	} else {
-		writeStringOrDie(e, file, "Caching of binaries was not enabled\n")
+		writeStringOrDie(e, file, fmt.Sprintf("Caching of binaries was not enabled, being written to %q\n", e.binDir))
 	}
 
 	shellPath := "/bin/sh"