On Sun, Sep 10, 2017 at 6:58 AM, Masahiro Yamada
[off-list ref] wrote:

"is_reserved_word()" sounds like a boolean function
that returns 1 or 0.
Maybe, the choice of the function name was not nice.

Yeah, not great name. That's the old name, though - I didn't change
that part, I just changed how it used to return the token structure
pointer, which would be NULL when it wasn't a keyword.

I actually *should* have made it just return 0 for the "not a keyword"
case rather than -1, and that would have ended up being semantically
closer to the old use (because you could treat the return value as a
boolean, like you could with the token pointer). But it's been
literally decades since I used bison/flex, and I didn't remember the
rules for 'enum yytokentype', so I just thought "negative numbers for
error" was safer. Zero would have been fine, no token can have that
number anyway (it just means EOF).

And negative wasn't safer, it caused that bug due to the bare boolean
use I hadn't noticed.

Oh well.

          Linus