[PHP 8.0] Add exception witout variable

Author: TomasVotruba

grammar/php7.y

@@ -269,7 +269,7 @@ name_union:
 ;
 
 catch:
-    T_CATCH '(' name_union plain_variable ')' '{' inner_statement_list '}'
+    T_CATCH '(' name_union optional_plain_variable ')' '{' inner_statement_list '}'
         { $$ = Stmt\Catch_[$3, $4, $7]; }
 ;
 
@@ -916,6 +916,11 @@ callable_variable:
           { $$ = Expr\MethodCall[$1, $3, $4]; }
 ;
 
+optional_plain_variable:
+      /* empty */                                           { $$ = null; }
+    | plain_variable                                        { $$ = $1; }
+;
+
 variable:
       callable_variable                                     { $$ = $1; }
     | static_member                                         { $$ = $1; }

lib/PhpParser/Node/Stmt/Catch_.php

@@ -9,21 +9,21 @@ class Catch_ extends Node\Stmt
 {
     /** @var Node\Name[] Types of exceptions to catch */
     public $types;
-    /** @var Expr\Variable Variable for exception */
+    /** @var Expr\Variable|null Variable for exception */
     public $var;
     /** @var Node\Stmt[] Statements */
     public $stmts;
 
     /**
      * Constructs a catch node.
      *
-     * @param Node\Name[]   $types      Types of exceptions to catch
-     * @param Expr\Variable $var        Variable for exception
-     * @param Node\Stmt[]   $stmts      Statements
-     * @param array         $attributes Additional attributes
+     * @param Node\Name[]           $types      Types of exceptions to catch
+     * @param Expr\Variable|null    $var        Variable for exception
+     * @param Node\Stmt[]           $stmts      Statements
+     * @param array                 $attributes Additional attributes
      */
     public function __construct(
-        array $types, Expr\Variable $var, array $stmts = [], array $attributes = []
+        array $types, Expr\Variable $var = null, array $stmts = [], array $attributes = []
     ) {
         $this->attributes = $attributes;
         $this->types = $types;
@@ -34,7 +34,7 @@ public function __construct(
     public function getSubNodeNames() : array {
         return ['types', 'var', 'stmts'];
     }
-    
+
     public function getType() : string {
         return 'Stmt_Catch';
     }