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* elaborate.cxx:
(delete_statement_symresolution_info): New struct.
(symresolution_info::visit_delete_statement): Use it.
(delete_statement_typeresolution_info): New struct.
(typeresolution_info::visit_delete_statement): Use it.
(symresolution_info::find_var): Accept -1 as 'unknown' arity.
* elaborate.h: Update to reflect changes in .cxx.
* translate.cxx (mapvar::del): New method.
(c_unparser::getmap): Check arity >= 1;
(delete_statement_operand_visitor): New struct.
(c_unparser::visit_delete_statement): Use it.
* staptree.cxx (vardecl::set_arity): Accept and ignore -1.
(vardecl::compatible_arity): Likewise.
* testsuite/buildok/eight.stp: New test for 'delete' operator.
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