g77 strictly assigns types to all constants not
documented as "typeless" (typeless constants including `'1'Z',
for example).
Many other Fortran compilers attempt to assign types to typed constants
based on their context.
This results in hard-to-find bugs, nonportable
code, and is not in the spirit (though it strictly follows the letter)
of the 77 and 90 standards.
g77 might offer, in a future release, explicit constructs by
which a wider variety of typeless constants may be specified, and/or
user-requested warnings indicating places where g77 might differ
from how other compilers assign types to constants.
See section Context-Sensitive Constants, for more information on this issue.
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