std::string as YYSTYPE segfaults

[Magnus Ekhall]

Hi!

I'm using Flex with Bison, and having some trouble passing strings from
Flex to Bison.
I know that Flex only points to a temporary buffer, so I have defined
YYSTYPE to be std::String.
In my Flex file I write:

TOKEN       {yylval = string(yytext, yyleng); return TOKEN;}
etc

It works for a number of tokens, but then I get a segmentation fault:
"
in basic_string<char, string_char_traits<char>,
__default_alloc_template<false, 0> >::Rep::release (this=0xfffffff0)
"

Does anyone know why? And maybe a way to get around the problem?

/
Magnus E