The GNU Fortran Compiler: Alternate complex function syntax

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#### 6.2.4 Alternate complex function syntax

Some Fortran compilers, including `g77`, let the user declare complex functions with the syntax `COMPLEX FUNCTION name*16()`, as well as `COMPLEX*16 FUNCTION name()`. Both are non-standard, legacy extensions. `gfortran` accepts the latter form, which is more common, but not the former.