From 54b09e2efa0b2c501ec24d7ffeb0d95e46ca4df4 Mon Sep 17 00:00:00 2001
From: Roger Standridge <9526806+archie2x@users.noreply.github.com>
Date: Tue, 20 Aug 2024 10:19:23 -0700
Subject: [PATCH] Fix #4421 `-C DIR` support go1.19

Signed-off-by: Roger Standridge <9526806+archie2x@users.noreply.github.com>
---
 main.go | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/main.go b/main.go
index 74db8785bd..227c869c94 100644
--- a/main.go
+++ b/main.go
@@ -16,7 +16,6 @@ import (
 	"regexp"
 	"runtime"
 	"runtime/pprof"
-	"slices"
 	"sort"
 	"strconv"
 	"strings"
@@ -1961,6 +1960,7 @@ type outputEntry struct {
 //
 //  2. A toolchain switch later on reinvokes the new go command with the same arguments.
 //     The parent toolchain has already done the chdir; the child must not try to do it again.
+
 func handleChdirFlag() {
 	used := 2 // b.c. command at os.Args[1]
 	if used >= len(os.Args) {
@@ -1977,11 +1977,11 @@ func handleChdirFlag() {
 			return
 		}
 		dir = os.Args[used+1]
-		os.Args = slices.Delete(os.Args, used, used+2)
+		os.Args = slicesDelete(os.Args, used, used+2)
 
 	case strings.HasPrefix(a, "-C="), strings.HasPrefix(a, "--C="):
 		_, dir, _ = strings.Cut(a, "=")
-		os.Args = slices.Delete(os.Args, used, used+1)
+		os.Args = slicesDelete(os.Args, used, used+1)
 	}
 
 	if err := os.Chdir(dir); err != nil {
@@ -1989,3 +1989,14 @@ func handleChdirFlag() {
 		os.Exit(1)
 	}
 }
+
+// go1.19 compatibility: lacks slices package
+func slicesDelete[S ~[]E, E any](s S, i, j int) S {
+	_ = s[i:j:len(s)] // bounds check
+
+	if i == j {
+		return s
+	}
+
+	return append(s[:i], s[j:]...)
+}