Effect sets on function signatures (ILO-361 Phase 3 MVP)#672
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Introduces optional `^variant|variant` effect-set annotations on Result-returning function signatures. The verifier infers which error literals propagate from each function body and emits ILO-E001 warnings when the declared set is narrower than the inferred set. The new `ilo check --show-effects` flag prints inferred (and declared) effect sets for all functions in a file. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
^variant|varianteffect-set clause to function signatures, written after the return type:process order:order > R order t ^invalid|timeout^exprpositions in Result-returning function bodies and emitsILO-E001warning when the declared set is narrower than the inferred setilo check --show-effectsflag prints inferred (and declared) effect sets for every function in a fileMVP shape
This is the inference + annotation surface only. Full enforcement (superset check at call sites, integration with Phase 2 fix plans) is filed as follow-up per the ticket scope.
f x:n>R n t ^invalid|timeout;body^sigil mirrors existing^errmatch-arm syntaxILO-E001warning when declared set misses an inferred variant--show-effectsCLI flag for auditing and annotation authoringTest plan
cargo test— all 4,773 tests pass, 0 failuresilo check examples/effect-sets.ilo --show-effects— shows correct inferred setsCloses ILO-361
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