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diagnostics: don't crash when declaring the error token as an nterm

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Reported by wcventure.
http://lists.gnu.org/archive/html/bug-bison/2019-03/msg00008.html

* src/symtab.c (complain_class_redeclared): Don't print empty
locations.
There can only be empty locations for predefined symbols.  And the
only symbol that is lexically available is the error token.  So this
appears to be the only possible way to have an error involving an
empty location.
* tests/input.at (Symbol class redefinition): Check it.
This commit is contained in:
Akim Demaille
2019-03-30 09:37:22 +01:00
parent bbf37f2534
commit a8558bc5a6
2 changed files with 11 additions and 4 deletions
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9
src/symtab.c
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@@ -309,9 +309,12 @@ complain_class_redeclared (symbol *sym, symbol_class class, location second)
class == token_sym
? _("symbol %s redeclared as a token")
: _("symbol %s redeclared as a nonterminal"), sym->tag);
i += SUB_INDENT;
complain_indent (&sym->location, complaint, &i,
_("previous definition"));
if (!location_empty (sym->location))
{
i += SUB_INDENT;
complain_indent (&sym->location, complaint, &i,
_("previous definition"));
}
}