From b81db531b24a6824bf5b89d8460baed5d5418835 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Wed, 8 Jan 2025 12:03:12 +0900
Subject: [PATCH] [Bug #21011] `nd_value` is NULL in massign

---
 compile.c               | 2 +-
 test/ruby/test_parse.rb | 9 +++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/compile.c b/compile.c
index 585420214b..73fc303037 100644
--- a/compile.c
+++ b/compile.c
@@ -10417,7 +10417,7 @@ compile_shareable_literal_constant(rb_iseq_t *iseq, LINK_ANCHOR *ret, enum rb_pa
     VALUE lit = Qnil;
     DECL_ANCHOR(anchor);
 
-    enum node_type type = nd_type(node);
+    enum node_type type = node ? nd_type(node) : NODE_NIL;
     switch (type) {
       case NODE_TRUE:
         *value_p = Qtrue;
diff --git a/test/ruby/test_parse.rb b/test/ruby/test_parse.rb
index a2f64200f3..eaf9412ded 100644
--- a/test/ruby/test_parse.rb
+++ b/test/ruby/test_parse.rb
@@ -1721,6 +1721,15 @@ x = __ENCODING__
     end;
   end
 
+  def test_shareable_constant_value_massign
+    a = eval_separately("#{<<~"begin;"}\n#{<<~'end;'}")
+    begin;
+      # shareable_constant_value: experimental_everything
+      A, = 1
+    end;
+    assert_equal(1, a)
+  end
+
   def test_if_after_class
     assert_valid_syntax('module if true; Object end::Kernel; end')
     assert_valid_syntax('module while true; break Object end::Kernel; end')