From d0d7a3203b19835c7eecab3a24598c3664380663 Mon Sep 17 00:00:00 2001
From: joaks <joaks@uber.com>
Date: Mon, 1 Jul 2024 20:22:29 +0000
Subject: [PATCH] use build tags

---
 errcheck/embedded_walker.go     |  4 ++--
 errcheck/embedded_walker_121.go | 10 ++++++++++
 errcheck/embedded_walker_122.go | 10 ++++++++++
 3 files changed, 22 insertions(+), 2 deletions(-)
 create mode 100644 errcheck/embedded_walker_121.go
 create mode 100644 errcheck/embedded_walker_122.go

diff --git a/errcheck/embedded_walker.go b/errcheck/embedded_walker.go
index ab5c17a..98f28e9 100644
--- a/errcheck/embedded_walker.go
+++ b/errcheck/embedded_walker.go
@@ -84,8 +84,8 @@ func walkThroughEmbeddedInterfaces(sel *types.Selection) ([]types.Type, bool) {
 }
 
 func getTypeAtFieldIndex(startingAt types.Type, fieldIndex int) types.Type {
-	t := maybeDereference(types.Unalias(startingAt))
-	t = maybeUnname(types.Unalias(t))
+	t := maybeDereference(maybeUnalias(startingAt))
+	t = maybeUnname(maybeUnalias(t))
 	s, ok := t.(*types.Struct)
 	if !ok {
 		panic(fmt.Sprintf("cannot get Field of a type that is not a struct, got a %T", t))
diff --git a/errcheck/embedded_walker_121.go b/errcheck/embedded_walker_121.go
new file mode 100644
index 0000000..f2df684
--- /dev/null
+++ b/errcheck/embedded_walker_121.go
@@ -0,0 +1,10 @@
+//go:build !go1.22
+// +build !go1.22
+
+package errcheck
+
+import "go/types"
+
+func maybeUnalias(t types.Type) types.Type {
+	return t
+}
diff --git a/errcheck/embedded_walker_122.go b/errcheck/embedded_walker_122.go
new file mode 100644
index 0000000..cbff3cd
--- /dev/null
+++ b/errcheck/embedded_walker_122.go
@@ -0,0 +1,10 @@
+//go:build go1.22
+// +build go1.22
+
+package errcheck
+
+import "go/types"
+
+func maybeUnalias(t types.Type) types.Type {
+	return types.Unalias(t)
+}