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gfortranstill uses this design, except that the constant pool is now mapped to read-only storage, so it is no longer possible to overwrite constants (which could be a source of hard-to-find bugs in the past!). I have searched manuals for old IBM and VMS Fortran compilers for the past 40 minutes, but have been unable to find any language that spells out these inner workings in explicit detail.%VAL (arg).