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@@ -95,6 +95,9 @@ See also the item "$undefined" below.
 Consider deprecating impure push parsers.  They add a lot of complexity, for
 a bad feature.
 
+It's not clear to me that yyerror_range really needs to be in pstate,
+instead of just being a local variable.
+
 * Bison 3.7
 ** Unit rules / Injection rules (Akim Demaille)
 Maybe we could expand unit rules (or "injections", see