cmd/go: idx could be equal to zero

cuiweixie · cuiweixie · commit 4255e2fcf55d · 2026-04-15T20:30:21.000+08:00
diff --git a/src/cmd/go/internal/bug/bug.go b/src/cmd/go/internal/bug/bug.go
@@ -175,7 +175,7 @@ func printCmdOut(w io.Writer, prefix, path string, args ...string) {
 // firstLine returns the first line of a given byte slice.
 func firstLine(buf []byte) []byte {
 	idx := bytes.IndexByte(buf, '\n')
-	if idx > 0 {
+	if idx >= 0 {
 		buf = buf[:idx]
 	}
 	return bytes.TrimSpace(buf)

Original file line number	Diff line number	Diff line change
`@@ -175,7 +175,7 @@ func printCmdOut(w io.Writer, prefix, path string, args ...string) {`
`175`	`175`	`// firstLine returns the first line of a given byte slice.`
`176`	`176`	`func firstLine(buf []byte) []byte {`
`177`	`177`	`idx := bytes.IndexByte(buf, '\n')`
`178`		`- if idx > 0 {`
	`178`	`+ if idx >= 0 {`
`179`	`179`	`buf = buf[:idx]`
`180`	`180`	`}`
`181`	`181`	`return bytes.TrimSpace(buf)`