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To correctly implement this, it must be known on instantiation whether E is copy-constructible, which is not the case if only a forward declaration is available. This can be resolved either by making sure a full definition of E is available, which is preferable. But in cases where this is not (easily) possible, the information can be explicitly provided by the MOZ_DECLARE_COPY_CONSTRUCTIBLE and MOZ_DECLARE_NON_COPY_CONSTRUCTIBLE macros. In particular, declarations for IPDL-declared types are added to nsTArray.h itself, like it was already done for MOZ_DECLARE_RELOCATE_USING_MOVE_CONSTRUCTOR. Differential Revision: https://phabricator.services.mozilla.com/D66244 --HG-- extra : moz-landing-system : lando