Merge branch '3.4' into 4.3

* 3.4:
  #30432 fix an error message
  fix paths to detect code owners
  [Validator] Ensure numeric subpaths do not cause errors on PHP 7.4
  Remove unused local variables in tests
  Make sure to collect child forms created on *_SET_DATA events
  do not render errors for checkboxes twice

Author: nicolas-grekas

Tests/Annotation/RouteTest.php

@@ -19,7 +19,7 @@ class RouteTest extends TestCase
     public function testInvalidRouteParameter()
     {
         $this->expectException('BadMethodCallException');
-        $route = new Route(['foo' => 'bar']);
+        new Route(['foo' => 'bar']);
     }
 
     public function testTryingToSetLocalesDirectly()

Tests/Fixtures/AnnotatedClasses/FooTrait.php

@@ -6,7 +6,7 @@ trait FooTrait
 {
     public function doBar()
     {
-        $baz = self::class;
+        self::class;
         if (true) {
         }
     }

Tests/Generator/Dumper/PhpGeneratorDumperTest.php

@@ -211,7 +211,7 @@ public function testGenerateNonExistingRoute()
         include $this->testTmpFilepath;
 
         $projectUrlGenerator = new \NonExistingRoutesUrlGenerator(new RequestContext());
-        $url = $projectUrlGenerator->generate('NonExisting', []);
+        $projectUrlGenerator->generate('NonExisting', []);
     }
 
     public function testDumpForRouteWithDefaults()

Tests/RouteCompilerTest.php

@@ -247,31 +247,31 @@ public function testRouteWithSameVariableTwice()
         $this->expectException('LogicException');
         $route = new Route('/{name}/{name}');
 
-        $compiled = $route->compile();
+        $route->compile();
     }
 
     public function testRouteCharsetMismatch()
     {
         $this->expectException('LogicException');
         $route = new Route("/\xE9/{bar}", [], ['bar' => '.'], ['utf8' => true]);
 
-        $compiled = $route->compile();
+        $route->compile();
     }
 
     public function testRequirementCharsetMismatch()
     {
         $this->expectException('LogicException');
         $route = new Route('/foo/{bar}', [], ['bar' => "\xE9"], ['utf8' => true]);
 
-        $compiled = $route->compile();
+        $route->compile();
     }
 
     public function testRouteWithFragmentAsPathParameter()
     {
         $this->expectException('InvalidArgumentException');
         $route = new Route('/{_fragment}');
 
-        $compiled = $route->compile();
+        $route->compile();
     }
 
     /**