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15.3.3 Intrinsics in PARAMETER Statements

g77 doesn't allow intrinsics in PARAMETER statements.

Related to this, g77 doesn't allow non-integral exponentiation in PARAMETER statements, such as `PARAMETER (R=2**.25)'. It is unlikely g77 will ever support this feature, as doing it properly requires complete emulation of a target computer's floating-point facilities when building g77 as a cross-compiler. But, if the gcc back end is enhanced to provide such a facility, g77 will likely use that facility in implementing this feature soon afterwards.