From 116d402067c1d01ed67b16ec93fb523bd5109d07 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Tue, 20 Feb 2024 19:34:50 +0900
Subject: [Feature #19979] Method definition with `&nil`

Allow methods to declare that they don't accept a block via `&nil`.
---
 parse.y | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'parse.y')

diff --git a/parse.y b/parse.y
index b874e4f8dc..6e0c610a7c 100644
--- a/parse.y
+++ b/parse.y
@@ -6562,6 +6562,11 @@ f_block_arg	: blkarg_mark tIDENTIFIER
                         $$ = $2;
                     /*% ripper: blockarg!($:2) %*/
                     }
+                | blkarg_mark keyword_nil
+                    {
+                        $$ = idNil;
+                    /*% ripper: blockarg!(ID2VAL(idNil)) %*/
+                    }
                 | blkarg_mark
                     {
                         arg_var(p, idFWD_BLOCK);
@@ -14474,6 +14479,10 @@ new_args_tail(struct parser_params *p, rb_node_kw_arg_t *kw_args, ID kw_rest_arg
     struct rb_args_info *args = &node->nd_ainfo;
     if (p->error_p) return node;
 
+    if (block == idNil) {
+        block = 0;
+        args->no_blockarg = TRUE;
+    }
     args->block_arg      = block;
     args->kw_args        = kw_args;
 
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