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15.3.30 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.