Ppxlib.Reserved_namespacesval reserve : Base.String.t -> Base.Unit.treserve "foo" has two implications:
check_unusedThis is here to insure that the rewriter cohabits well with other rewriter or tools (e.g. merlin) which might leave attribute on the AST.
N.B. the "merlin" namespace is reserved by default.
val is_in_reserved_namespaces : Base.String.t -> Base.Bool.t