type failure_mode =
  | Preserved
  | Representation_exposure
  | Strictness_shift
  | Effect_shift
  | Type_error of string
  | Other_failure of string

type invariant_kind =
  | Relation_preservation
  | Target_arity
  | Termination_class
  | Effect_trace

type invariant_result = {
  kind : invariant_kind;
  passed : bool;
  detail : string;
}

type pass_boundary = {
  pass : string;
  source_outcome : Source.outcome option;
  target_outcome : Target.outcome option;
  effects : int;
  verdict : string;
}

type obligation_status =
  | Discharged
  | Assumed
  | Refuted

type obligation_result = {
  obligation : Pipeline.obligation;
  status : obligation_status;
  note : string;
}

type case_audit = {
  case : Corpus.case;
  compiled : Pipeline.compiled;
  comparison : Relation.comparison;
  source_trace : Source.trace;
  specialised_trace : Source.trace;
  inlined_trace : Source.trace;
  target_trace : Target.trace;
  typecheck : (unit, string) result;
  failure_mode : failure_mode;
  obligations : obligation_result list;
  invariants : invariant_result list;
  pass_boundaries : pass_boundary list;
}

val audit_case : Corpus.case -> case_audit
val failure_mode_to_string : failure_mode -> string
val obligation_status_to_string : obligation_status -> string
val invariant_kind_to_string : invariant_kind -> string
val emit_pass_boundaries : case_audit -> string
val emit_invariants : case_audit -> string
val emit_case_audit : case_audit -> string
val emit_matrix : case_audit list -> string