[PRISM] Fix defined? for chained calls

peterzhu2118 · peterzhu2118 · commit 0520e9675b91 · 2024-01-16T08:32:21.000-05:00
Fixes ruby/prism#2148.
diff --git a/prism_compile.c b/prism_compile.c
@@ -2607,8 +2607,10 @@ pm_compile_defined_expr0(rb_iseq_t *iseq, const pm_node_t *node, LINK_ANCHOR *co
             pm_compile_defined_expr0(iseq, call_node->receiver, ret, src, popped, scope_node, dummy_line_node, lineno, true, lfinish, true);
             if (PM_NODE_TYPE_P(call_node->receiver, PM_CALL_NODE)) {
                 ADD_INSNL(ret, &dummy_line_node, branchunless, lfinish[2]);
-                ID method_id = pm_constant_id_lookup(scope_node, call_node->name);
-                pm_compile_call(iseq, (const pm_call_node_t *)call_node->receiver, ret, src, popped, scope_node, method_id, NULL);
+
+                const pm_call_node_t *receiver = (const pm_call_node_t *)call_node->receiver;
+                ID method_id = pm_constant_id_lookup(scope_node, receiver->name);
+                pm_compile_call(iseq, receiver, ret, src, popped, scope_node, method_id, NULL);
             }
             else {
                 ADD_INSNL(ret, &dummy_line_node, branchunless, lfinish[1]);
diff --git a/test/ruby/test_compile_prism.rb b/test/ruby/test_compile_prism.rb
@@ -209,6 +209,15 @@ def test_DefinedNode
 
       assert_prism_eval("defined?(a(itself))")
       assert_prism_eval("defined?(itself(itself))")
+
+      # Method chain on a constant
+      assert_prism_eval(<<~RUBY)
+        class PrismDefinedNode
+          def m1; end
+        end
+
+        defined?(PrismDefinedNode.new.m1)
+      RUBY
     end
 
     def test_GlobalVariableReadNode
