Using and Porting GNU Fortran
9.2 Trailing Comment
g77 supports use of `/*' to start a trailing
comment.
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 `/*', but
`//' already denotes concatenation, and such a "comment"
might actually result in a program that compiles without
error (though it would likely behave incorrectly).
