fortran-break-delimiters-re is a variable defined in `fortran.el'.
Its value is
"[-+*/><=, ]"
This variable may be risky if used as a file-local variable.
Documentation:
Regexp matching delimiter characters at which lines may be broken.
There are certain tokens comprised entirely of characters
matching this regexp that should not be split, and these are
specified by the constant `fortran-no-break-re'.