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! CMake Fortran parser does not understand the `#if !defined(...)`
! syntax, so it does not guard against recursive inclusion. Unless
! the parser keeps track of already visited files, this leads to
! processing of around 2^N files, where N is the maximal number of
! open files. Because N is typically of the order of 1000, without
! bookkeeping this test hangs.
#if !defined(test_include_loop_fh)
#define test_include_loop_fh
#include "test_include_loop.fh"
#include "test_include_loop.fh"
#endif
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