Issues

• Optimized native entrypoint generates different text on two identical calls

  Bug

  roc-lang/roc#12328 · Filter by author lukewilliamboswell opened on Oct 16, 2026
  

• ARC: nested recursive result retains builder arrays and prevents unique append reuse

  perf
  Bug

  roc-lang/roc#12327 · Filter by author lukewilliamboswell opened on Oct 16, 2026
  

• "type not determined" when a value has parser_for constraints of two formats and its function has no annotation

  roc-lang/roc#12310 · Filter by author Karakatiza666 opened on Oct 15, 2026

• Json encodes a record field of an opaque type over Str or a number with no encoder_for (and crashes over Bool)

  roc-lang/roc#12309 · Filter by author Karakatiza666 opened on Oct 15, 2026

• High peak compiler RSS for tiny roc-pdf consumers: about 2.3 GB for roc check

  roc-lang/roc#12304 · Filter by author lukewilliamboswell opened on Oct 15, 2026
  2

• Roc fmt should not add a comma alone on a line before a closing parenthesis

  roc-lang/roc#12302 · Filter by author ageron opened on Oct 15, 2026

• Unexpected operator binding after a if stmt

  roc-lang/roc#12300 · Filter by author zhenweigc opened on Oct 15, 2026

• roc test crash

  Bug

  roc-lang/roc#12295 · Filter by author notramo opened on Oct 14, 2026
  

• A warm build rebuilds a capturing top-level closure on the heap that a cold build reads from static data

  roc-lang/roc#12294 · Filter by author grayrest opened on Oct 14, 2026

• Interpreter: Dict.insert in a fold is quadratic

  interpreter
  Bug

  roc-lang/roc#12290 · Filter by author rtfeldman opened on Oct 14, 2026
  

• Extend fuzzing

  roc-lang/roc#12289 · Filter by author notramo opened on Oct 14, 2026

• The program was killed by signal 11: SIGSEGV (Segmentation fault).

  roc-lang/roc#12286 · Filter by author stopusingghpls opened on Oct 14, 2026

• roc build --specialize=no segfault on for loop destructuring error

  boxy
  Bug

  roc-lang/roc#12274 · Filter by author notramo opened on Oct 13, 2026
  

• roc build --specialize=no segfault

  boxy
  Bug

  roc-lang/roc#12273 · Filter by author notramo opened on Oct 13, 2026
  

• roc build --specialize=no segfault

  boxy
  Bug

  roc-lang/roc#12272 · Filter by author notramo opened on Oct 13, 2026
  

• CLI argument typo detection

  Feature

  roc-lang/roc#12269 · Filter by author InvisOn opened on Oct 13, 2026

• Concurrent host calls leave GlobalBoxyRuntime.call_depth nonzero after all calls return

  boxy
  roc-lang/roc#12267 · Filter by author KouYuume opened on Oct 13, 2026

• Row subsumption: a method call on a wrapper that forwards a closed error row is rejected, though the same qualified call is widened

  Bug

  roc-lang/roc#12262 · Filter by author lukewilliamboswell opened on Oct 13, 2026
  

• Str: decode the longest valid UTF-8 prefix, for input that arrives in chunks

  Feature

  roc-lang/roc#12259 · Filter by author lukewilliamboswell opened on Oct 12, 2026

• Stream: a re-framing adapter where one item yields zero or many outputs

  Feature

  roc-lang/roc#12258 · Filter by author lukewilliamboswell opened on Oct 12, 2026

• Stream: short-circuiting consumers (fold_try!, fold_until!)

  Feature

  roc-lang/roc#12257 · Filter by author lukewilliamboswell opened on Oct 12, 2026

• Interpreter backend unusable with x64win platforms on Windows (x64mingw-only build, duplicate compiler-rt symbols on run)

  Bug

  roc-lang/roc#12254 · Filter by author lukewilliamboswell opened on Oct 12, 2026
  

• LSP live-updates for imported non-Roc files

  roc-lang/roc#12252 · Filter by author Giesch opened on Oct 12, 2026

• Remaining compiler efficiency inventory items

  Task

  roc-lang/roc#12233 · Filter by author rtfeldman opened on Oct 11, 2026

• Boxy panic: SIGSEGV

  boxy
  Bug

  roc-lang/roc#12231 · Filter by author JRI98 opened on Oct 11, 2026