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8.2.6 _gfortran_caf_deregister — Deregistering coarrays

Called to free the memory of a coarray; the processor calls this function for automatic and explicit deallocation. In case of an error, this function shall fail with an error message, unless the STAT variable is not null.
void caf_deregister (const caf_token_t *token, int *stat, char *errmsg, int errmsg_len)

stat intent(out) Stores the STAT=; may be NULL
errmsg intent(out) When an error occurs, this will be set to an error message; may be NULL
errmsg_len the buffer size of errmsg.

For nonalloatable coarrays this function is never called. If a cleanup is required, it has to be handled via the finish, stop and error stop functions, and via destructors.