[help-flex] yy_pop_state "unrecognized rule"

[Aaron S. Hawley]

i'm an inexperienced flex trying to get states to work.  flex complains
yy_pop_state() is an unrecognized rule.

behavoior seen in:
flex 2.5.4 with gcc on AIX 5.1
flex 2.5.10 with cc on AIX 4.3
flex 2.5.10 with cc on AIX 5.1
flex 2.5.10 with gcc on AIX 5.1

%> gmake LEX=flex CFLAGS=-lfl statestest
flex  -t statestest.l > statestest.c
statestest.l: 27: unrecognized rule
statestest.l: 27: unrecognized rule
statestest.l: 27: unrecognized rule

/* line 1 */
%x FOO

%option stack
%option main
%%

<INITIAL>foo
{
        printf("Found foo\n");
        BEGIN(FOO);
}

<INITIAL>.|\n
{
        ECHO;
}

<INITIAL><FOO>.+
{
        printf("In foo: ");
        ECHO;
}

<INITIAL><FOO>\n
{
        yy_pop_state(); /* line 27 */
}

%%

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