Nonportable Conversions
-----------------------
`g77' doesn't accept some particularly nonportable, silent data-type
conversions such as `LOGICAL' to `REAL' (as in `A=.FALSE.', where `A'
is type `REAL'), that other compilers might quietly accept.
Some of these conversions are accepted by `g77' when the
`-fugly-logint' option is specified. Perhaps it should accept more or
all of them.