From dfdc5d40ec25e42ff63982958c43d425bee909fb Mon Sep 17 00:00:00 2001
From: yui-knk <spiketeika@gmail.com>
Date: Wed, 26 Nov 2025 14:11:23 +0900
Subject: [PATCH] Check and raise semantics errors on nested variables captures
 in patterns

This commit makes these codes to be invalid.

```ruby
case 0
in [a] | 1
end

case 0
in { a: b } | 1
end

case 0
in [{ a: [{ b: [{ c: }] }] }] | 1
end
```
---
 parse.y                                      | 6 +-----
 test/.excludes-parsey/TestPatternMatching.rb | 1 -
 2 files changed, 1 insertion(+), 6 deletions(-)
 delete mode 100644 test/.excludes-parsey/TestPatternMatching.rb

diff --git a/parse.y b/parse.y
index f6222ea52e..a9fccdd5f7 100644
--- a/parse.y
+++ b/parse.y
@@ -5468,11 +5468,6 @@ p_top_expr_body	: p_expr
                 ;
 
 p_expr		: p_as
-                    {
-                        p->ctxt.in_alt_pattern = 0;
-                        p->ctxt.capture_in_pattern = 0;
-                        $$ = $1;
-                    }
                 ;
 
 p_as		: p_expr tASSOC p_variable
@@ -5494,6 +5489,7 @@ p_alt		: p_alt[left] '|'[alt]
                         if (p->ctxt.capture_in_pattern) {
                             yyerror1(&@alt, "alternative pattern after variable capture");
                         }
+                        p->ctxt.in_alt_pattern = 0;
                         $$ = NEW_OR($left, $right, &@$, &@alt);
                     /*% ripper: binary!($:left, ID2VAL(idOr), $:right) %*/
                     }
diff --git a/test/.excludes-parsey/TestPatternMatching.rb b/test/.excludes-parsey/TestPatternMatching.rb
deleted file mode 100644
index 20a1868d0c..0000000000
--- a/test/.excludes-parsey/TestPatternMatching.rb
+++ /dev/null
@@ -1 +0,0 @@
-exclude(:test_alternative_pattern_nested, "Deeply nested captures variables are missing a syntax error")