Revert "Add check for leading backslash in Name ctor"

This reverts commit 2f67429ec93857b8a3ae5a15165818e5eda8fb56.

Reverting this to avoid a BC break in a patch release, will
reapply for the next major version.

CHANGELOG.md

@@ -11,11 +11,6 @@ Version 4.0.4-dev
   * `var()`
   * `propertyFetch()`
   
-### Changed
-
-* Passing a string with a leading backslash to the `Name` constructor will now throw an exception.
-  Most likely a use of `Name\FullyQualified` was intended.
-  
 ### Deprecated
 
 * `Builder\Param::setTypeHint()` has been deprecated in favor of the newly introduced

lib/PhpParser/Node/Name.php

@@ -222,10 +222,6 @@ class Name extends NodeAbstract
                 throw new \InvalidArgumentException('Name cannot be empty');
             }
 
-            if ('\\' === $name[0]) {
-                throw new \InvalidArgumentException('Name cannot start with backslash. Did you mean to use Name\FullyQualified?');
-            }
-
             return explode('\\', $name);
         } elseif (\is_array($name)) {
             if (empty($name)) {

test/PhpParser/Node/NameTest.php

@@ -155,14 +155,6 @@ class NameTest extends TestCase
         new Name([]);
     }
 
-    /**
-     * @expectedException \InvalidArgumentException
-     * @expectedExceptionMessage Name cannot start with backslash. Did you mean to use Name\FullyQualified?
-     */
-    public function testInvalidLeadingBackslash() {
-        new Name('\Foo');
-    }
-
     /** @dataProvider provideTestIsSpecialClassName */
     public function testIsSpecialClassName($name, $expected) {
         $name = new Name($name);