[cocci] Support for unary operator matching

[Stefan Winter <sw@stefan-winter.net>]

Hi,

I'm trying to match a unary operator with Coccinelle:

$ cat unary.cocci
@@
expression x;
unary operator o = {-};
@@
- o x
+ x

But it seems Coccinelle is choking on "unary":

$ spatch --cocci-file unary.cocci <(echo "int i = -42;")     
init_defs_builtins: /usr/lib/coccinelle/standard.h
meta: parse error: 
  File "unary.cocci", line 3, column 0, charpos = 17
  around = 'unary',
  whole content = unary operator o = {-};

Did I get something wrong or is this supposed to work according to
https://coccinelle.gitlabpages.inria.fr/website/docs/main_grammar.html ?

Thanks,
Stefan