Issues

`roc build --target=wasm32 --opt=dev` emits an invalid module (`values remaining on stack at end of block`) when a nominal tag union holding `Box({})` is the payload of a two-variant tag union

Bug

#11455

· niclas-ahden opened

on Sep 18, 2026

`roc build --target=wasm32 --opt=speed` output traps with `indirect call type mismatch` when two `List.concat` calls have different refcounted element types

Bug

#11454

· niclas-ahden opened

on Sep 18, 2026

`roc build --opt=dev` panics with `missing required method call encode_record` when a method does `Json.to_str` of three nested record aliases

Bug

#11453

· niclas-ahden opened

on Sep 18, 2026

LLVM 4x compile time regression from inlining

Bug

#11451

· grayrest opened

on Sep 18, 2026

Dev backend frees still-referenced data since ARC worker emission (2e8927a9df1); worker count also changes emitted LIR

Bug

#11449

· lukewilliamboswell opened

on Sep 18, 2026

Dev backend never reuses stack slots: multi-hundred-KiB page-probed frames in large procedures

Bug

#11448

· lukewilliamboswell opened

on Sep 17, 2026

`roc build` segfaults when a package method returns the open error union of a file-level function that does `Json.to_str` of a record with two fields

Bug

#11444

· niclas-ahden opened

on Sep 17, 2026

`roc check` and `roc build` segfault when an unannotated top-level helper calls a method whose body does `Json.to_str` of a record holding its generic argument

Bug

#11441

· niclas-ahden opened

on Sep 17, 2026

`roc test`'s summary doesn't mention `expect`s with type errors

Bug

#11439

· niclas-ahden opened

on Sep 17, 2026

Flaky under load: Monotype creates two specializations for one closed request with four workers (issue 10831 regression test)

Bug

#11438

· rtfeldman opened

on Sep 17, 2026

Eval test runner: random test crashes with a general protection fault in the checker inside the forked child

Bug

#11437

· rtfeldman opened

on Sep 17, 2026

builtin_compiler bake is not reproducible: index fields in Builtin.bin and Builtin.artifact.bin shift by a per-run constant

Bug

#11430

· rtfeldman opened

on Sep 16, 2026

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All issues

`roc build --target=wasm32 --opt=dev` emits an invalid module (`values remaining on stack at end of block`) when a nominal tag union holding `Box({})` is the payload of a two-variant tag union

`roc build --target=wasm32 --opt=speed` output traps with `indirect call type mismatch` when two `List.concat` calls have different refcounted element types

`roc build --opt=dev` panics with `missing required method call encode_record` when a method does `Json.to_str` of three nested record aliases

LLVM 4x compile time regression from inlining

Dev backend frees still-referenced data since ARC worker emission (2e8927a9df1); worker count also changes emitted LIR

Dev backend never reuses stack slots: multi-hundred-KiB page-probed frames in large procedures

`roc build` segfaults when a package method returns the open error union of a file-level function that does `Json.to_str` of a record with two fields

`roc check` and `roc build` segfault when an unannotated top-level helper calls a method whose body does `Json.to_str` of a record holding its generic argument

`roc test`'s summary doesn't mention `expect`s with type errors

Flaky under load: Monotype creates two specializations for one closed request with four workers (issue 10831 regression test)

Eval test runner: random test crashes with a general protection fault in the checker inside the forked child

builtin_compiler bake is not reproducible: index fields in Builtin.bin and Builtin.artifact.bin shift by a per-run constant

Uh oh!

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