7 files declare their use of RenderableInterface
- Breadcrumb.php in core/lib/ Drupal/ Core/ Breadcrumb/ Breadcrumb.php 
- ExampleRenderable.php in core/modules/ system/ tests/ modules/ twig_theme_test/ src/ ExampleRenderable.php 
- FormattedDateDiff.php in core/lib/ Drupal/ Core/ Datetime/ FormattedDateDiff.php 
- Link.php in core/lib/ Drupal/ Core/ Link.php 
- theme.inc in core/includes/ theme.inc 
- The theme system, which controls the output of Drupal.
- TwigExtension.php in core/lib/ Drupal/ Core/ Template/ TwigExtension.php 
- TwigExtensionTest.php in core/tests/ Drupal/ Tests/ Core/ Template/ TwigExtensionTest.php 
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