add lib/pq

vendor/github.com/lib/pq/as_go126.go

@@ -0,0 +1,23 @@
+//go:build go1.26
+
+package pq
+
+import (
+	"errors"
+	"github.com/lib/pq/pqerror"
+	"slices"
+)
+
+// As asserts that the given error is [pq.Error] and returns it, returning nil
+// if it's not a pq.Error.
+//
+// It will return nil if the pq.Error is not one of the given error codes. If no
+// codes are given it will always return the Error.
+//
+// This is safe to call with a nil error.
+func As(err error, codes ...pqerror.Code) *Error {
+	if pqErr, ok := errors.AsType[*Error](err); ok && (len(codes) == 0 || slices.Contains(codes, pqErr.Code)) {
+		return pqErr
+	}
+	return nil
+}