A sequence-directive with an empty association-name-list is treated as if it contained the name of all
implicitly mapped variables and COMMON blocks in the scoping unit
which cannot otherwise be determined to be sequential or nonsequential
by their language context.
A sequential variable may not be explicitely mapped unless it is
a scalar or rank-one array, and is an aggregate cover. If there
is more than one aggregate cover for an aggregate variable group,
only one may be explicitly mapped.
If a COMMON block is nonsequential, then all of the
following must hold:
Every occurrence of the COMMON block has exactly the
same number of components with each corresponding component
having a storage sequence of exactly the same size;
If a component is a nonsequential variable in any
occurrence of the COMMON block, then it must be
nonsequential with identical type, shape, and mapping
attributes in every occurrence of the COMMON block;
If a component is sequential and explicitly mapped
(either a variable or an aggregate variable group with
an explicitly mapped aggregate cover)
in any occurrence of the COMMON block,
then it must be sequential and explicitly mapped with
identical mapping attributes in every
occurrence of the COMMON block. In addition, the type and
shape of the explicitly mapped variable must be identical in
all occurrences; and
Every occurrence of the COMMON block must be
nonsequential.