Merge branch '2.8' into 3.2

* 2.8:
  fix risky tests
  [Yaml] release memory after parsing
  [HttpFoundation] Fix and test status codes according to IANA's data
  Add `use_strict_mode` in validOptions for session
  [Console] Inherit phpdoc from OutputFormatterInterface

Author: nicolas-grekas

Parser.php

@@ -109,6 +109,12 @@ public function parse($value, $flags = 0)
             mb_internal_encoding($mbEncoding);
         }
 
+        $this->lines = array();
+        $this->currentLine = '';
+        $this->refs = array();
+        $this->skippedLineNumbers = array();
+        $this->locallySkippedLineNumbers = array();
+
         if (null !== $e) {
             throw $e;
         }

Tests/InlineTest.php

@@ -277,24 +277,39 @@ public function testParseUnquotedAsteriskFollowedByAComment()
      * @expectedException \Symfony\Component\Yaml\Exception\ParseException
      * @expectedExceptionMessage cannot start a plain scalar; you need to quote the scalar.
      */
-    public function testParseUnquotedScalarStartingWithReservedIndicator($indicator)
+    public function testParseUnquotedScalarStartingWithReservedAtIndicator()
     {
-        Inline::parse(sprintf('{ foo: %sfoo }', $indicator));
+        Inline::parse('{ foo: @foo }');
     }
 
-    public function getReservedIndicators()
+    /**
+     * @group legacy
+     * @expectedDeprecation Not quoting the scalar "`foo " starting with "`" is deprecated since Symfony 2.8 and will throw a ParseException in 3.0.
+     * throws \Symfony\Component\Yaml\Exception\ParseException in 3.0
+     */
+    public function testParseUnquotedScalarStartingWithReservedBacktickIndicator()
+    {
+        Inline::parse('{ foo: `foo }');
+    }
+
+    /**
+     * @group legacy
+     * @expectedDeprecation Not quoting the scalar "|foo " starting with "|" is deprecated since Symfony 2.8 and will throw a ParseException in 3.0.
+     * throws \Symfony\Component\Yaml\Exception\ParseException in 3.0
+     */
+    public function testParseUnquotedScalarStartingWithLiteralStyleIndicator()
     {
-        return array(array('@'), array('`'));
+        Inline::parse('{ foo: |foo }');
     }
 
     /**
      * @dataProvider getScalarIndicators
      * @expectedException \Symfony\Component\Yaml\Exception\ParseException
      * @expectedExceptionMessage cannot start a plain scalar; you need to quote the scalar.
      */
-    public function testParseUnquotedScalarStartingWithScalarIndicator($indicator)
+    public function testParseUnquotedScalarStartingWithFoldedStyleIndicator()
     {
-        Inline::parse(sprintf('{ foo: %sfoo }', $indicator));
+        Inline::parse('{ foo: >foo }');
     }
 
     public function getScalarIndicators()