ICE: tree check in lookup_decl_die

trass3r avatartrass3r created an issue
    struct Test2_WorkaroundForBug2986 {
        interface J {}
        class B : J {}
$ gdc -g -funittest -c traits.d
traits.d:1:0: internal compiler error: tree check: expected tree that contains 'decl minimal' structure, have 'record_type' in lookup_decl_die, at dwarf2out.c:8145
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