[cocci] Avoiding duplicate elements in SmPL disjunctions?

Hello,

I tried the following script variant out for the semantic patch language.

@display@
statement s;
@@
*while (1)
    s


Questionable test result (according to the software combination “Coccinelle 1.3.0”):
Markus_Elfring@Sonne:…/Projekte/Coccinelle/janitor> /usr/bin/spatch --parse-cocci show_unlimited_while_loops.cocci
…
(
*while *(*1*) 
|
*while *(*1 *!= *0*) 
|
*while *(*1*) 
|
*while *(*0 *!= *1*) 
)s
…


An element of the generated SmPL disjunction got repeated somehow.
How do you think about to avoid such duplicate code?

Regards,
Markus