ast.c: AST.of against C method should return nil (as Ruby 2.6--3.0)

2 files changed, 2 insertions, 2 deletions

diff --git a/ast.c b/ast.c
index e1c044e24c..84e5fdcecc 100644
--- a/ast.c
+++ b/ast.c
@@ -214,7 +214,7 @@ ast_s_of(rb_execution_context_t *ec, VALUE module, VALUE body, VALUE keep_script
             iseq = rb_method_iseq(body);
         }
         if (!iseq) {
-            rb_raise(rb_eArgError, "cannot get AST for method that is not defined in Ruby");
+            return Qnil;
         }
         if (rb_iseq_from_eval_p(iseq)) {
             rb_raise(rb_eArgError, "cannot get AST for method defined in eval");
diff --git a/test/ruby/test_ast.rb b/test/ruby/test_ast.rb
index 0b5c41058c..953c8435c3 100644
--- a/test/ruby/test_ast.rb
+++ b/test/ruby/test_ast.rb
@@ -233,7 +233,7 @@ class TestAst < Test::Unit::TestCase
 
   def test_of_c_method
     c = Class.new { attr_reader :foo }
-    assert_raise(ArgumentError) { RubyVM::AbstractSyntaxTree.of(c.instance_method(:foo)) }
+    assert_nil(RubyVM::AbstractSyntaxTree.of(c.instance_method(:foo)))
   end
 
   def test_scope_local_variables