g77 supports use of
/* to start a trailing
In the GNU Fortran language,
! is used for this purpose.
/* is not in the GNU Fortran language
because the use of
/* in a program might
suggest to some readers that a block, not trailing, comment is
started (and thus ended by
*/, not end of line),
since that is the meaning of
/* in C.
Also, such readers might think they can use
// to start
a trailing comment as an alternative to
// already denotes concatenation, and such a "comment"
might actually result in a program that compiles without
error (though it would likely behave incorrectly).