parse.y: args tail at error

* parse.y (new_args_tail_gen): abandon parsing arguments after
  error.  reported by ilsani Martino Sani (ilsani) at
  https://hackerone.com/reports/221201

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58466 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

2 files changed, 8 insertions, 0 deletions

diff --git a/parse.y b/parse.y
index 11cab865a2..86486ac38a 100644
--- a/parse.y
+++ b/parse.y
@@ -9965,6 +9965,7 @@ new_args_tail_gen(struct parser_params *parser, NODE *k, ID kr, ID b)
 
     args = ZALLOC(struct rb_args_info);
     node = NEW_NODE(NODE_ARGS, 0, 0, args);
+    if (parser->error_p) return node;
 
     args->block_arg      = b;
     args->kw_args        = k;
diff --git a/test/ruby/test_parse.rb b/test/ruby/test_parse.rb
index b4a63e369d..c2ee56ae52 100644
--- a/test/ruby/test_parse.rb
+++ b/test/ruby/test_parse.rb
@@ -958,6 +958,13 @@ x = __ENCODING__
     assert_syntax_error("    0b\n", /\^/)
   end
 
+  def test_error_def_in_argument
+    assert_separately([], "#{<<-"begin;"}\n#{<<~"end;"}")
+    begin;
+      assert_syntax_error("def f r:def d; def f 0end", /unexpected/)
+    end;
+  end
+
 =begin
   def test_past_scope_variable
     assert_warning(/past scope/) {catch {|tag| eval("BEGIN{throw tag}; tap {a = 1}; a")}}