- If a discriminated type has default_expressions for its discriminants,
then unconstrained variables of the type are permitted, and the discriminants
of such a variable can be changed by assignment to the variable. For a
formal parameter of such a type, an attribute is provided to determine
whether the corresponding actual parameter is constrained or unconstrained.
- For a prefix A that is of a discriminated type (after any implicit
dereference), the following attribute is defined:
Yields the value True if A denotes a constant, a value, or a
constrained variable, and False otherwise.
- The execution of a construct is erroneous if the construct has a
constituent that is a name denoting a subcomponent that depends on
discriminants, and the value of any of these discriminants is changed by this
execution between evaluating the name and the last use (within this
execution) of the subcomponent denoted by the name.
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