From 627a832cc15f9321cbf97eb5692e515800b30f6f Mon Sep 17 00:00:00 2001
From: Patrick Reimers <patrick@reimers.me>
Date: Fri, 1 Mar 2019 19:39:07 +0100
Subject: [PATCH] Return non zero exit code on deprecation

---
 src/Composer/Package/Loader/ValidatingArrayLoader.php | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/Composer/Package/Loader/ValidatingArrayLoader.php b/src/Composer/Package/Loader/ValidatingArrayLoader.php
index 405e567f0..a8aa65331 100644
--- a/src/Composer/Package/Loader/ValidatingArrayLoader.php
+++ b/src/Composer/Package/Loader/ValidatingArrayLoader.php
@@ -195,7 +195,9 @@ class ValidatingArrayLoader implements LoaderInterface
         foreach (array_keys(BasePackage::$supportedLinkTypes) as $linkType) {
             if ($this->validateArray($linkType) && isset($this->config[$linkType])) {
                 foreach ($this->config[$linkType] as $package => $constraint) {
-                    if (!preg_match('{^[A-Za-z0-9_./-]+$}', $package)) {
+                    if ($err = self::hasPackageNamingError($package, true)) {
+                        $this->warnings[] = 'Deprecation warning: '.$linkType.'.'.$err.' Make sure you fix this as Composer 2.0 will error.';
+                    } elseif (!preg_match('{^[A-Za-z0-9_./-]+$}', $package)) {
                         $this->warnings[] = $linkType.'.'.$package.' : invalid key, package names must be strings containing only [A-Za-z0-9_./-]';
                     }
                     if (!is_string($constraint)) {