Switch to errors.Join (#54)

Author: pkwarren

decode.go

@@ -178,10 +178,7 @@ func (o UnmarshalOptions) unmarshalNode(node *yaml.Node, message proto.Message,
 		}
 	}
 
-	if len(unm.errors) > 0 {
-		return unmarshalErrors(unm.errors)
-	}
-	return nil
+	return errors.Join(unm.errors...)
 }
 
 const atTypeFieldName = "@type"

errors.go

@@ -58,18 +58,3 @@ type violationError struct {
 func (v *violationError) Error() string {
 	return protovalidate.FieldPathString(v.Violation.GetField()) + ": " + v.Violation.GetMessage() + " (" + v.Violation.GetConstraintId() + ")"
 }
-
-// TODO: Use errors.Join instead, once we drop support for Go <1.21.
-type unmarshalErrors []error
-
-func (ue unmarshalErrors) Error() string {
-	errorStrings := make([]string, len(ue))
-	for i, err := range ue {
-		errorStrings[i] = err.Error()
-	}
-	return strings.Join(errorStrings, "\n")
-}
-
-func (ue unmarshalErrors) Unwrap() []error {
-	return ue
-}