[cocci] Matching function pointer casts

Hi,

I have a hard time trying to come up with a semantic patch that would
match function pointer casts, specifically (void (*)(void)) in my case.

I want to get rid of these and replace them with a properly typed
functions that'd do necessary type conversions. (I already have that
part, though.)

Below are two attempts I tried and did not work;

1.
@pfunc_cast@
identifier fn;
fresh identifier fnthunk = "THUNK_" ## fn;
@@
- (void (*)(void)) &fn
+ &fnthunk

Above doesn't parse for me (spatch version 1.1.0).

2.
@pfunc_cast@
identifier fn;
fresh identifier fnthunk = "THUNK_" ## fn;
type T =~ "^void (*)(void)$";
@@
- (T) &fn
+ &fnthunk

as well as 3.
@pfunc_cast@
identifier fn;
fresh identifier fnthunk = "THUNK_" ## fn;
type T =~ "void \\(*\\)\\(void\\)";
@@
- (T) &fn
+ &fnthunk


This basically matches all address taking expressions, even without
casts, and replaces them by &THUNK_... -- not quite what I want. ;)
It looks like to completely ignoring the regular expression for the type
match beside complaining about syntax errors when one does some?

Is there a way to match function pointer casts in spatch at all?

Thanks,
Mathias