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(g77-300.info)Trailing Comment

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Trailing Comment
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   `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).