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From: Stanislav Artemkin <artemkin@gmail.com>
To: Ocaml Mailing List <caml-list@inria.fr>
Content-Type: multipart/alternative; boundary=089e011615a025edc50525eedf1a
Subject: [Caml-list] Unary negation parsing

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Hi all,

I've just stumbled upon yet another question about unary negation parsing (
http://stackoverflow.com/questions/34044873/passing-negative-integer-to-a-function-in-ocaml
):

let f x = x + 1 in
f -1

is not valid in OCaml.

I'm just wondering why this issue is still not addressed in the parser? For
example, F# parses "f -1" as unary negation, but "f - 1" and "f-1" as
binary operator. It looks a bit tricky (as whitespace is taken into
account), but feels so natural when writing code.

Is there any reason we can't have the same in OCaml?

PS. I understand that it may break existing code, but it should be solvable
by a compiler option similar to -safe-string etc.

Thank you

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<div dir=3D"ltr">Hi all,<div><br></div><div>I&#39;ve just stumbled upon yet=
 another question about unary negation parsing (<a href=3D"http://stackover=
flow.com/questions/34044873/passing-negative-integer-to-a-function-in-ocaml=
">http://stackoverflow.com/questions/34044873/passing-negative-integer-to-a=
-function-in-ocaml</a>):</div><div><br></div><div>let f x =3D x + 1 in</div=
><div>f -1</div><div><br></div><div>is not valid in OCaml.</div><div><br></=
div><div>I&#39;m just wondering why this issue is still not addressed in th=
e parser? For example, F# parses &quot;f -1&quot; as unary negation, but &q=
uot;f - 1&quot; and &quot;f-1&quot; as binary operator. It looks a bit tric=
ky (as whitespace is taken into account), but feels so natural when writing=
 code.</div><div><br></div><div>Is there any reason we can&#39;t have the s=
ame in OCaml?</div><div><br></div><div>PS. I understand that it may break e=
xisting code, but it should be solvable by a compiler option similar to -sa=
fe-string etc.</div><div><br></div><div>Thank you</div><div><br></div></div>

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