3 files changed, 7 insertions, 4 deletions
diff --git a/parse.y b/parse.y
index 11b158954d..ab61f5378d 100644
--- a/parse.y
+++ b/parse.y
@@ -9241,9 +9241,9 @@ parse_ident(struct parser_params *p, int c, int cmd_state)
     ident = tokenize_ident(p, last_state);
     if (result == tCONSTANT && is_local_id(ident)) result = tIDENTIFIER;
     if (!IS_lex_state_for(last_state, EXPR_DOT|EXPR_FNAME) &&
-	(result == tIDENTIFIER) && /* not EXPR_FNAME, not attrasgn */
-	lvar_defined(p, ident)) {
-	SET_LEX_STATE(EXPR_END|EXPR_LABEL);
+        (result == tIDENTIFIER) && /* not EXPR_FNAME, not attrasgn */
+        (lvar_defined(p, ident) || NUMPARAM_ID_P(ident))) {
+        SET_LEX_STATE(EXPR_END|EXPR_LABEL);
     }
     return result;
 }
diff --git a/test/ruby/test_syntax.rb b/test/ruby/test_syntax.rb
index 53036cab3b..39ad8875a0 100644
--- a/test/ruby/test_syntax.rb
+++ b/test/ruby/test_syntax.rb
@@ -1632,6 +1632,9 @@ eom
         assert_raise(NameError) {eval("_1")},
       ]
     }
+
+    assert_valid_syntax("proc {def foo(_);end;_1}")
+    assert_valid_syntax("p { [_1 **2] }")
   end
 
   def test_value_expr_in_condition
diff --git a/version.h b/version.h
index cdb24afd0f..c7d897d8d3 100644
--- a/version.h
+++ b/version.h
@@ -11,7 +11,7 @@
 # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
 #define RUBY_VERSION_TEENY 4
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 236
+#define RUBY_PATCHLEVEL 237
 
 #define RUBY_RELEASE_YEAR 2023
 #define RUBY_RELEASE_MONTH 7