bug #3830 Catch errors thrown during template rendering (richards-square)

This PR was squashed before being merged into the 3.x branch.

Discussion
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Catch errors thrown during template rendering

Some errors, like not providing a function the proper number of arguments or division by zero, extend from `\Error` rather than `\Exception`. This PR catches these types of errors during template rendering and throws a `RuntimeError` in order to provide better debugging information.

Commits
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85bf01b4 Catch errors thrown during template rendering

src/Error/Error.php

@@ -53,7 +53,7 @@ class Error extends \Exception
      * @param int         $lineno  The template line where the error occurred
      * @param Source|null $source  The source context where the error occurred
      */
-    public function __construct(string $message, int $lineno = -1, Source $source = null, \Exception $previous = null)
+    public function __construct(string $message, int $lineno = -1, Source $source = null, \Throwable $previous = null)
     {
         parent::__construct('', 0, $previous);
 

src/Template.php

@@ -181,7 +181,7 @@ abstract class Template
                 }
 
                 throw $e;
-            } catch (\Exception $e) {
+            } catch (\Throwable $e) {
                 $e = new RuntimeError(sprintf('An exception has been thrown during the rendering of a template ("%s").', $e->getMessage()), -1, $template->getSourceContext(), $e);
                 $e->guess();
 
@@ -404,7 +404,7 @@ abstract class Template
             }
 
             throw $e;
-        } catch (\Exception $e) {
+        } catch (\Throwable $e) {
             $e = new RuntimeError(sprintf('An exception has been thrown during the rendering of a template ("%s").', $e->getMessage()), -1, $this->getSourceContext(), $e);
             $e->guess();
 

tests/ErrorTest.php

@@ -234,6 +234,28 @@ EOHTML
         }
     }
 
+    public function testTwigArgumentCountErrorThrowsRuntimeExceptions()
+    {
+        $loader = new ArrayLoader([
+            'argument-error.html' => <<<EOHTML
+{# max requires at least one argument #}
+{{ max() }}
+EOHTML
+        ]);
+
+        $twig = new Environment($loader, ['debug' => true, 'cache' => false]);
+
+        $template = $twig->load('argument-error.html');
+        try {
+            $template->render();
+
+            $this->fail();
+        } catch (RuntimeError $e) {
+            $this->assertEquals(2, $e->getTemplateLine());
+            $this->assertEquals('argument-error.html', $e->getSourceContext()->getName());
+        }
+    }
+
     public function getErroredTemplates()
     {
         return [