bug #20855 [Yaml] do not trigger deprecations for valid YAML (xabbuh)

This PR was merged into the 3.2 branch.

Discussion
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[Yaml] do not trigger deprecations for valid YAML

| Q             | A
| ------------- | ---
| Branch?       | 3.2
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #19874
| License       | MIT
| Doc PR        |

Commits
-------

1436349 do not trigger deprecations for valid YAML

src/Symfony/Component/Yaml/Inline.php

@@ -463,8 +463,8 @@ private static function parseMapping($mapping, $flags, &$i = 0, $references = ar
                 break;
             }
 
-            if (!isset($mapping[$i + 1]) || ' ' !== $mapping[$i + 1]) {
-                @trigger_error('Omitting the space after the colon that follows a mapping key definition is deprecated since version 3.2 and will throw a ParseException in 4.0.', E_USER_DEPRECATED);
+            if (!isset($mapping[$i + 1]) || !in_array($mapping[$i + 1], array(' ', '[', ']', '{', '}'), true)) {
+                @trigger_error('Using a colon that is not followed by an indication character (i.e. " ", ",", "[", "]", "{", "}" is deprecated since version 3.2 and will throw a ParseException in 4.0.', E_USER_DEPRECATED);
             }
 
             // value

src/Symfony/Component/Yaml/Tests/InlineTest.php

@@ -166,7 +166,7 @@ public function testParseInvalidMappingKeyShouldThrowException()
 
     /**
      * @group legacy
-     * @expectedDeprecation Omitting the space after the colon that follows a mapping key definition is deprecated since version 3.2 and will throw a ParseException in 4.0.
+     * @expectedDeprecation Using a colon that is not followed by an indication character (i.e. " ", ",", "[", "]", "{", "}" is deprecated since version 3.2 and will throw a ParseException in 4.0.
      * throws \Symfony\Component\Yaml\Exception\ParseException in 4.0
      */
     public function testParseMappingKeyWithColonNotFollowedBySpace()
@@ -395,6 +395,8 @@ public function getTestsForParse()
             array('[foo, {bar: foo}]', array('foo', array('bar' => 'foo'))),
             array('{ foo: {bar: foo} }', array('foo' => array('bar' => 'foo'))),
             array('{ foo: [bar, foo] }', array('foo' => array('bar', 'foo'))),
+            array('{ foo:{bar: foo} }', array('foo' => array('bar' => 'foo'))),
+            array('{ foo:[bar, foo] }', array('foo' => array('bar', 'foo'))),
 
             array('[  foo, [  bar, foo  ]  ]', array('foo', array('bar', 'foo'))),