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…stiveness All three catch clause kinds now share one control path in each compiler phase; a kind only selects policy (CatchClauseKind::requires_error_coverage, wildcard_traps_panics, requires_panic_coverage). - hir_ty: restore E0062 for a catch_all that leaves a thrown type unhandled (B-1787; lost in the TIR -> hir_ty cutover). Each clause is judged against the residual it receives, and nothing a catch_all receives propagates. catch_all_panics must also cover every panic. - MIR: one dispatch for every clause kind. A wildcard arm whose clause does not trap panics is entered after an IsTypeTag(PANIC) test that passes a panic on to the next arm, so a later clause in a chain can still catch it (previously a later catch_all_panics disabled the guard for every clause, and the guard rethrew instead of trying later arms). - Remove the ThrowIfPanic terminator/opcode end to end; bump bex_cache and baml_artifact format versions for the shifted opcode discriminants. - AST: lower a bare-token catch base (`x catch ...`, `1 catch ...`) instead of Expr::Missing, which passed check and then failed MIR lowering. - Docs: keyword docs, TEST_INSTRUCTIONS, errors.mdx. Co-Authored-By: Claude Opus 5.5 <[email protected]>
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| if let Some(panic) = self.panic_subset(&claim) { | ||
| trapped_panics.push(panic.clone()); |
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When a catch_all_panics arm uses a refutable destructuring pattern such as baml.panics.IndexOutOfBounds { index: 0 }, lower_pattern(..., Unknown).matched_ty denotes the entire panic class even though PatternOutcome::consumes_matched is false. Adding that type to trapped_panics therefore makes panics_not_trapped consider every IndexOutOfBounds covered, so no E0062 is emitted although a panic with another index fails the runtime pattern and escapes the promised boundary. Coverage needs to retain the pattern's refutability (or use the pattern matrix), rather than recording only its nominal matched type.
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Fixed in 77c3ee4. Coverage now uses the probe's consumes_matched, so a refutable arm such as IndexOutOfBounds { index: 0 } or Greeting { text: "hi" } neither counts toward panic coverage nor discharges an error fact. That is the B-1069 rule match already applies. Both shapes are covered in catch_all_coverage (RefutableErrorArm, RefutablePanicArm).
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Review comments at @baml_language/crates/baml_compiler2_hir_ty/src/infer.rs:
- Around line 10806-10808: Update the wildcard inference flow around
wildcard_traps_panics and traps_every_panic to include the panic type among the
wildcard arm’s possible inputs and in the clause binding where applicable, so an
arm that receives a panic does not infer its binding as never when no error
facts remain.
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⛔ Files ignored due to path filters: 7
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baml_language/TEST_INSTRUCTIONS.mdbaml_language/crates/baml_artifact/src/lib.rsbaml_language/crates/baml_builtins2/keyword_docs/baml_keywords.yamlbaml_language/crates/baml_compiler2_ast/src/ast.rsbaml_language/crates/baml_compiler2_ast/src/lower_expr_body.rsbaml_language/crates/baml_compiler2_emit/src/analysis.rsbaml_language/crates/baml_compiler2_emit/src/emit.rsbaml_language/crates/baml_compiler2_emit/src/stack_carry.rsbaml_language/crates/baml_compiler2_hir_ty/src/diagnostics.rsbaml_language/crates/baml_compiler2_hir_ty/src/infer.rsbaml_language/crates/baml_compiler2_mir/src/builder.rsbaml_language/crates/baml_compiler2_mir/src/ir.rsbaml_language/crates/baml_compiler2_mir/src/lower.rsbaml_language/crates/baml_compiler2_mir/src/memory.rsbaml_language/crates/baml_compiler2_mir/src/optimize.rsbaml_language/crates/baml_compiler2_mir/src/pretty.rsbaml_language/crates/baml_compiler2_visualization/src/control_flow/from_ast.rsbaml_language/crates/baml_db/src/check.rsbaml_language/crates/baml_tests/baml_src/ns_catch_clauses/catch_clauses.bamlbaml_language/crates/baml_tests/baml_src/ns_fixtures/ns_catch_all_panics/catch_all_panics.bamlbaml_language/crates/baml_tests/projects/diagnostic_errors/catch_all_coverage/catch_all_coverage.bamlbaml_language/crates/baml_tests/src/compiler2_tir/mod.rsbaml_language/crates/baml_type/src/typetag.rsbaml_language/crates/bex_cache/src/lib.rsbaml_language/crates/bex_vm/src/debug.rsbaml_language/crates/bex_vm/src/vm.rsbaml_language/crates/bex_vm/src/vm/error_evidence.rsbaml_language/crates/bex_vm_types/src/bytecode.rsbaml_language/crates/bex_vm_types/src/errors.rsbaml_language/crates/bex_vm_types/src/relink.rsbaml_language/crates/btel_recorder/proto/recording.protobaml_language/crates/btel_records/src/lib.rstypescript2/app-developer-docs/content/baml/book/errors.mdx
💤 Files with no reviewable changes: 4
- baml_language/crates/bex_vm/src/vm/error_evidence.rs
- baml_language/crates/bex_vm_types/src/relink.rs
- baml_language/crates/baml_compiler2_mir/src/builder.rs
- baml_language/crates/baml_compiler2_mir/src/ir.rs
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Binary size checks failed❌ 2 violations · ✅ 1 passed
Details & how to fixViolations:
Add/update baselines:
[artifacts.bridge_wasm]
file_bytes = 26027997
gzip_bytes = 7635559
[artifacts.packed-program]
file_bytes = 39712192
gzip_bytes = 16203000Generated by |
- A refutable catch arm (`Foo { x: 1 }`, `IndexOutOfBounds { index: 0 }`)
handles only some values of its type, so it no longer discharges an
error fact or counts toward catch_all_panics panic coverage (the B-1069
rule match already applies).
- A catch_all_panics wildcard arm's binding includes the panics no earlier
arm trapped, instead of `never` once the errors are drained.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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Fixes B-1787: a
catch_allthat left a thrown type unhandled compiled silently. Its exhaustiveness check was deleted in the TIR → hir_ty cutover (#4301). The snapshot for the existing regression fixture (CatchAllMissingString) was rewritten at the time, so the suite approved the bug.While fixing it, this PR routes
catch,catch_all, andcatch_all_panicsthrough one control path in each compiler phase. The clause kind now only selects policy (CatchClauseKind::{requires_error_coverage, wildcard_traps_panics, requires_panic_coverage}). That also fixes a few related bugs.Behaviour changes
catch_allmust be exhaustive again (E0062)greet() catch_all (e) { int => {}, Greeting => {} } // error[E0062]: non-exhaustive catch_all on type int | string | Greeting; missing: stringcatch_allafter a partialcatchmust cover the residual."oops"→string), as E0096 does.catch_allreceives propagates past it, so a caller withthrows neverno longer gets a second, far-away E0096.catch_all_panicsmust cover panics too (E0062)_/ barelet x) or abaml.panics.Panicarm now satisfies the check; otherwise E0062 reportsmissing: baml.panics.Panic(or the specific panic classes left).Chained clauses route panics correctly
oob() catch (e) { _ => "first" } catch_all_panics (p) { _ => "panic" } // before: "first" (the later catch_all_panics disabled the first clause's panic guard) // after: "panic"catch_all_panics. Now a panic passes over such a wildcard to the next arm.x catch …/1 catch …Expr::Missing. It type-checked silently, then failed MIR lowering with an internal "parse error".1 + 1 catch (e) {…}reported a bogusE0004 … 2 | !error.Implementation
keyword()) onCatchClauseKind. These replace four hand-rolled keyword-string matches.infer_catch: one loop for all kinds.judge_catch_coverageemitsNonExhaustiveCatchAll, which now carries the clause keyword.lower_catch: one dispatch for all kinds. A wildcard arm whose clause does not trap panics is entered viaemit_catch_wildcard_entry: oneIsTypeTag { tag: PANIC }branch that skips to the next arm. Catching an error still pays exactly one tag test before a wildcard, as before.ThrowIfPanicremoved end to end: the MIR terminator, emit, the VM opcode, debug/relink tables, and error evidence. The VM answers the newtypetag::PANICpseudo-tag in its existing int-tagIsTypepath withis_panic.TypeTagshifted, sobex_cache::FORMAT_VERSIONis now 21 andbaml_artifact::FORMAT_VERSIONis now 19.RaiseKind::PanicRethrow/RAISE_KIND_PANIC_RETHROWare no longer produced. A panic no arm takes is recorded as aRethrow(no-match). The variant is kept so older recordings decode.lower_catch_expr: reads the base from nodes or bare tokens (try_lower_bare_token), likeawait.catch,catch_all,catch_all_panics, and thecleanupdoc's nonexistentcatch { … }),TEST_INSTRUCTIONS.md("panics are not catchable" was wrong), anderrors.mdx(chain rule;catch_all_panicsexhaustiveness).Tests
projects/diagnostic_errors/catch_all_coverage: the B-1787 shape,throws neverinterplay, chain residuals, declared contracts, andcatch_all_panicserror and panic coverage, plus exhaustive forms that must compile.baml_src/ns_catch_clauses: runtime tests for chain panic routing (wildcard → latercatch_all_panics/ named panic arm / outer handler),catch_allresidual handling underthrows never, and bare-token bases.catch_throw_regressionssnapshot: E0062 forCatchAllMissingStringis restored.Not in this PR
From the triage at
thoughts/sam-projects/issue-triage/catch-system:bad() + one() catch …,spawn {…} catch …).Cancelledsettle state for spawned tasks. BEP-040 (BEP-040: Spawn modifiers #5037) just reworked that area.🤖 Generated with Claude Code
Summary by CodeRabbit
catch_allandcatch_all_panicsrequire complete coverage of the errors—and, where applicable, panics—they handle. Wildcard arms in ordinary catches let unmatched panics pass through; typed panic arms can catch them.