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"foo || bar" does not invoke bar on AIX 7.2 when foo does not exist. It just dies. Reported by Bruno Haible. https://lists.gnu.org/r/bug-bison/2020-05/msg00029.html * examples/c/reccalc/reccalc.test: Check for seq in a subshell.
reccalc - recursive calculator with Flex and Bison
In this example the generated parser is pure and reentrant: it can be used concurrently in different threads, or recursively. As a proof of this reentrancy, expressions in parenthesis are tokenized as strings, and then recursively parsed from the parser:
exp: STR
{
result r = parse_string ($1);
free ($1);
if (r.nerrs)
{
res->nerrs += r.nerrs;
YYERROR;
}
else
$$ = r.value;
}