Add return-types with help from DebugClassLoader in the CI

.github/patch-types.php

@@ -0,0 +1,45 @@
+<?php
+
+if (false === getenv('SYMFONY_PATCH_TYPE_DECLARATIONS')) {
+    putenv('SYMFONY_PATCH_TYPE_DECLARATIONS=force=1&php71-compat=0');
+}
+
+require __DIR__.'/../.phpunit/phpunit-8.3-0/vendor/autoload.php';
+
+file_put_contents(__DIR__.'/../vendor/autoload.php', preg_replace('/^return (Composer.*);/m', <<<'EOTXT'
+$loader = \1;
+$loader->addClassMap(['Symfony\Component\Debug\Exception\FlattenException' => \dirname(__DIR__).'/src/Symfony/Component/Debug/Exception/FlattenException.php']);
+
+return $loader;
+
+EOTXT
+, file_get_contents(__DIR__.'/../vendor/autoload.php')));
+
+$loader = require __DIR__.'/../vendor/autoload.php';
+
+Symfony\Component\ErrorHandler\DebugClassLoader::enable();
+
+foreach ($loader->getClassMap() as $class => $file) {
+    switch (true) {
+        case false !== strpos(realpath($file), '/vendor/'):
+        case false !== strpos($file, '/src/Symfony/Bridge/PhpUnit/'):
+        case false !== strpos($file, '/src/Symfony/Bundle/FrameworkBundle/Tests/Fixtures/Validation/Article.php'):
+        case false !== strpos($file, '/src/Symfony/Component/Config/Tests/Fixtures/BadParent.php'):
+        case false !== strpos($file, '/src/Symfony/Component/Debug/Tests/Fixtures/'):
+        case false !== strpos($file, '/src/Symfony/Component/DependencyInjection/Tests/Compiler/OptionalServiceClass.php'):
+        case false !== strpos($file, '/src/Symfony/Component/DependencyInjection/Tests/Fixtures/ParentNotExists.php'):
+        case false !== strpos($file, '/src/Symfony/Component/DependencyInjection/Tests/Fixtures/Prototype/BadClasses/MissingParent.php'):
+        case false !== strpos($file, '/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/'):
+        case false !== strpos($file, '/src/Symfony/Component/ErrorHandler/Tests/Fixtures/'):
+        case false !== strpos($file, '/src/Symfony/Component/PropertyInfo/Tests/Fixtures/Dummy.php'):
+        case false !== strpos($file, '/src/Symfony/Component/PropertyInfo/Tests/Fixtures/ParentDummy.php'):
+        case false !== strpos($file, '/src/Symfony/Component/Serializer/Tests/Normalizer/Features/ObjectOuter.php'):
+        case false !== strpos($file, '/src/Symfony/Component/VarDumper/Tests/Fixtures/NotLoadableClass.php'):
+        case false !== strpos($file, '/src/Symfony/Component/VarDumper/Tests/Fixtures/Php74.php') && \PHP_VERSION_ID < 70400:
+            continue 2;
+    }
+
+    class_exists($class);
+}
+
+Symfony\Component\ErrorHandler\DebugClassLoader::disable();

.travis.yml

@@ -25,12 +25,7 @@ env:
 
 matrix:
     include:
-        - php: 7.1
-          env: php_extra="7.2"
-        - php: 7.3
-          env: deps=high
         - php: 7.4snapshot
-          env: deps=low
     fast_finish: true
 
 cache:
@@ -79,10 +74,8 @@ before_install:
       export COMPONENTS=$(find src/Symfony -mindepth 2 -type f -name phpunit.xml.dist -printf '%h\n')
       find ~/.phpenv -name xdebug.ini -delete
 
-      if [[ $TRAVIS_PHP_VERSION = 7.4* && $deps ]]; then
-          export PHPUNIT_X="$PHPUNIT_X,issue-32995"
-      elif [[ $TRAVIS_PHP_VERSION = 7.4* ]]; then
-          export PHPUNIT_X="$PHPUNIT --group issue-32995"
+      if [[ $TRAVIS_PHP_VERSION = 7.4* ]]; then
+          export PHPUNIT_X="$PHPUNIT_X,issue-32995,legacy"
       fi
 
       nanoseconds () {
@@ -163,6 +156,7 @@ before_install:
     - |
       # Install extra PHP extensions
       for PHP in $TRAVIS_PHP_VERSION $php_extra; do
+          continue
           export PHP=$PHP
           phpenv global $PHP
           INI=~/.phpenv/versions/$PHP/etc/conf.d/travis.ini
@@ -270,6 +264,12 @@ install:
           ([[ $deps ]] && cd src/Symfony/Component/HttpFoundation; composer config platform.ext-mongodb 1.6.0; composer require --dev --no-update mongodb/mongodb)
           tfold 'composer update' $COMPOSER_UP
           tfold 'phpunit install' ./phpunit install
+
+          rm vendor/symfony/contracts -Rf
+          ln -sd $(realpath src/Symfony/Contracts) vendor/symfony/contracts
+          composer install --optimize-autoloader
+          php .github/patch-types.php
+
           if [[ $deps = high ]]; then
               echo "$COMPONENTS" | parallel --gnu "tfold {} 'cd {} && $COMPOSER_UP && $PHPUNIT_X$LEGACY'"
           elif [[ $deps = low ]]; then

composer.json

@@ -142,7 +142,6 @@
             "src/Symfony/Bridge/ProxyManager/Legacy/ProxiedMethodReturnExpression.php"
         ],
         "exclude-from-classmap": [
-            "**/Tests/"
         ]
     },
     "autoload-dev": {