self.require_declaration("NEW_{mtype.mclass.c_name}")
assert mtype isa MGenericType
var compiler = self.compiler
+ length = autobox(length, compiler.mainmodule.int_type)
if mtype.need_anchor then
hardening_live_open_type(mtype)
link_unresolved_type(self.frame.mpropdef.mclassdef, mtype)