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* exp_ch4.adb (Expand_N_Indexed_Component): For an indexed component with an implicit dereference as its prefix, use Insert_Explicit_Dereference instead of merely rewriting the prefix into an explicit dereference. This ensures that a reference to the original prefix is generated, if appropriate. * sem_util.adb (Insert_Explicit_Dereference): When an implicit dereference is rewritten to an explicit one, generate a reference to the entity denoted by its prefix using the original prefix node, so the dereference can be properly recorded as a read of the denoted access value, if appropriate. * sem_warn.adb (Output_Unreferenced_Messages): Do not abstain from emitting 'assigned but never read' warning on a variable on the basis that it has an access type. (Check_References): Emit unreferenced warning when the scope is a subprogram body. From-SVN: r91881
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