[ruby-core:109828] [Ruby master Bug#18739] Wrong mid-rule index

Issue #18739 has been updated by nagachika (Tomoyuki Chikanaga).

Backport changed from 2.7: DONTNEED, 3.0: DONTNEED, 3.1: REQUIRED to 2.7: DONTNEED, 3.0: DONTNEED, 3.1: DONE

ruby_3_1 ffd3d83ea8ccf111061a0f03036e5a093bb03674 merged revision(s) 08b6aacc1a14440e0f1644a05238559c6c585e38.

----------------------------------------
Bug #18739: Wrong mid-rule index
https://bugs.ruby-lang.org/issues/18739#change-99066

* Author: nobu (Nobuyoshi Nakada)
* Status: Closed
* Priority: Normal
* Assignee: nobu (Nobuyoshi Nakada)
* Backport: 2.7: DONTNEED, 3.0: DONTNEED, 3.1: DONE
----------------------------------------
`arg in pattern` rule in the `expr` has a wrong index.

```diff
diff --git a/parse.y b/parse.y
index d391354beaa..c7ed2edea07 100644
--- a/parse.y
+++ b/parse.y
@@ -1785,7 +1785,7 @@ expr		: command_call
 		  p_top_expr_body
 		    {
 			pop_pvtbl(p, $<tbl>3);
-			p->ctxt.in_kwarg = $<ctxt>1.in_kwarg;
+			p->ctxt.in_kwarg = $<ctxt>2.in_kwarg;
 		    /*%%%*/
 			$$ = NEW_CASE3($1, NEW_IN($4, NEW_TRUE(&@4), NEW_FALSE(&@4), &@4), &@$);
 		    /*% %*/
```



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