From 913772a08acb9ebf4ea91762ebcf5ccdb1d9732c Mon Sep 17 00:00:00 2001
From: eileencodes <eileencodes@gmail.com>
Date: Wed, 17 Jan 2024 10:50:58 -0500
Subject: [Prism] Implement defined? for PM_MODULE_NODE

Ruby code:

```ruby
defined?(module M; end)
```

Instructions:

```
"********* Ruby *************"
== disasm: #<ISeq:<compiled>@<compiled>:1 (1,0)-(59,16)>
0000 putobject                              "expression"              (  59)[Li]
0002 leave
"********* PRISM *************"
== disasm: #<ISeq:<compiled>@<compiled>:58 (58,0)-(58,16)>
0000 putobject                              "expression"              (  58)[Li]
0002 leave
```

Related: ruby/prism#2188
---
 prism_compile.c                 | 1 +
 test/ruby/test_compile_prism.rb | 1 +
 2 files changed, 2 insertions(+)

diff --git a/prism_compile.c b/prism_compile.c
index ec3ab32e10..da093e1861 100644
--- a/prism_compile.c
+++ b/prism_compile.c
@@ -2556,6 +2556,7 @@ pm_compile_defined_expr0(rb_iseq_t *iseq, const pm_node_t *node, LINK_ANCHOR *co
       case PM_MATCH_PREDICATE_NODE:
       case PM_MATCH_REQUIRED_NODE:
       case PM_MATCH_WRITE_NODE:
+      case PM_MODULE_NODE:
       case PM_NEXT_NODE:
       case PM_OR_NODE:
       case PM_RANGE_NODE:
diff --git a/test/ruby/test_compile_prism.rb b/test/ruby/test_compile_prism.rb
index d90289b904..a635683fc3 100644
--- a/test/ruby/test_compile_prism.rb
+++ b/test/ruby/test_compile_prism.rb
@@ -257,6 +257,7 @@ module Prism
       assert_prism_eval("defined?(if true; 1; end)")
       assert_prism_eval("defined?(/(?<foo>bar)/ =~ 'barbar')")
       assert_prism_eval("defined?(1 => 1)")
+      assert_prism_eval("defined?(module M; end)")
     end
 
     def test_GlobalVariableReadNode
-- 
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