Answer / guest

Cause: If a package spec p declares a function f, that
function may not be used in any variable declarations in
that same package spec. This is because of a circular
instantiation problem: in order to fully instantiate the
package spec, the variable must be initialized. To
initialize the variable, the function body code in the
package body must be executed. That requires that the
package body be instantiated. However, the package body
cannot be instantiated until the package spec is fully
instantiated.

Action: Remove the reference to the function from the
variable initialization. A technique which often works is to
move the variable initialization from the variable
declaration (in the package spec) to the package body
initialization block.

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