[Patch, fortran] PR20866 - recursive statement functions.

[Paul Thomas]

:ADDPATCH fortran:

This patch adds a new function to match.c to walk the expression for a 
statement function, looking for recursion to itself.  It recursively 
tests the expressions for any other statement functions it finds, in 
order to test for nested recursion.  A test and corresponding error is 
added to gfc_match_st_function.

Bubblestrapped and regtested on FC3/Athlon.  OK for mainline and 4.0?

Paul T
 

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