Categories addressed:
- pattern_match / pattern_match_cov (32): remove dead case/with clauses
that dialyzer proved unreachable from the caller types.
- contract_supertype / extra_range / invalid_contract /
contract_with_opaque (25): narrow @spec declarations to match actual
success typings.
- call / call_without_opaque (18): fix bad calls, narrow User.t to
allow nil for in-memory changeset structs, suppress Ecto.Multi
opaque-type false positives with targeted @dialyzer directives.
- guard_fail / no_return / unused_fun / unknown_function (13): remove
dead || fallbacks, simplify always-true params, cascade-resolve
no_returns via the underlying pattern_match and call fixes.
Real production bug fixed: StormDetector.handle_cast/2 had swapped
`:queue.in` args (`queue |> :queue.in(ts)` which desugars to
`:queue.in(queue, ts)` — wrong argument order). Alert timestamps
were never being enqueued, so storm detection would fail at runtime.
Corrected to `ts |> :queue.in(queue)`.
.dialyzer_ignore.exs: suppress two genuine dep-PLT gaps
(:ranch.get_addr/1 false positive from Bandit's transitive ranch,
and the Cloak.Vault GenServer callback_info on the CI build path).
`mix dialyzer` now: Total errors: 114, Skipped: 114 — passes clean.
Warnings: 88 → 0.
Graham McIntire
0350ced8e1