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REAL FUNCTION FOO ()
must be a
FUNCTION statement and
REAL FUNCTION FOO (5)
must be a type-definition statement,
REAL FUNCTION FOO (names)
where names is a comma-separated list of names, can be one or the other.
The only way to disambiguate that statement (short of mandating free-form source or a short maximum length for name for external procedures) is based on the context of the statement.
In particular, the statement is known to be within an
already-started program unit
(but not at the outer level of the
it is a type-declaration statement.
Otherwise, the statement is a
in that it begins a function program unit
(external, or, within
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