The function compute_access returns one of three values:
access_public
access_protected
access_private
DECL_ACCESS is used for access declarations; alter_access creates a list of types and accesses for a given decl.
Formerly, DECL_{PUBLIC,PROTECTED,PRIVATE} corresponded to the return codes of compute_access and were used as a cache for compute_access. Now they are not used at all.
TREE_PROTECTED and TREE_PRIVATE are used to record the access levels granted by the containing class. BEWARE: TREE_PUBLIC means something completely unrelated to access control!
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