[Cocci] Matching attributes

From: Lukas Straub <lukasstraub2@web.de>
To: Julia Lawall <julia.lawall@inria.fr>
Cc: cocci@systeme.lip6.fr
Subject: [Cocci] Matching attributes
Date: Sat, 9 Jan 2021 00:48:41 +0100	[thread overview]
Message-ID: <20210109004841.34cb9174@gecko.fritz.box> (raw)

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Hello Everyone,
I am toying with coccinelle to assist in writing c code. My first try is to
automatically free/cleanup local variables when they go out of scope.

This works very well already:

 @@
 type T;
 identifier var;
 attribute name autofree;
 @@

    T var
 -  autofree
    = NULL;
    ...
 ++ free(var);
    return ...;

But this fails:

 @@
 type T;
 identifier var;
 attribute name autofree;
 @@

    T var autofree;
    ...
 ++ free(var);
    return ...;

with

 minus: parse error: 
   File "autofree.cocci", line 7, column 17, charpos = 73
   around = ';',
   whole content =    T var autofree;

What am I doing wrong here?
I tried both with v1.0.8 and latest git.
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