The GNU Fortran Compiler: Legacy PARAMETER statements

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#### 6.1.31 Legacy PARAMETER statements

For compatibility, GNU Fortran supports legacy PARAMETER statements without parentheses with `-std=legacy`. A warning is emitted if used with `-std=gnu`, and an error is acknowledged with a real Fortran standard flag (`-std=f95`, etc...). These statements take the following form:

    implicit real (E)
    parameter e = 2.718282
    real c
    parameter c = 3.0e8