Issues

• Gren 0.6.3 and 0.6.6 compilers crash with --optimize: Map.!: given key is not an element in the map

  gren-lang/compiler#390 · Filter by author gilramir opened on Oct 16, 2026

• Two unannotated local functions that call each other fix the enclosing function's type variable

  gren-lang/compiler#389 · Filter by author gilramir opened on Sep 26, 2026

• Output to STDOUT blocks reporting to STDERR

  buggood first issue
  gren-lang/compiler#388 · Filter by author Jwashton opened on Sep 8, 2026
  1

• A port's definition can be emitted before the kernel code it calls

  bug
  gren-lang/compiler#387 · Filter by author gilramir opened on Sep 6, 2026

• A node program that crashes exits with status 0

  bug
  gren-lang/compiler#385 · Filter by author gilramir opened on Sep 5, 2026

• \u{FFFF} in a string literal produces the wrong result for a couple different reasons

  bug
  gren-lang/compiler#384 · Filter by author gilramir opened on Sep 3, 2026

• // truncates its result to 32 bits when inlined, but not when passed as a function

  buggood first issue
  gren-lang/compiler#383 · Filter by author gilramir opened on Aug 31, 2026
  1

• gren package validate should validate CHANGELOG entry

  enhancement
  gren-lang/compiler#382 · Filter by author blaix opened on Jul 18, 2026

• Compiler optimizing out unreferenced ports causes unexpected errors

  bugenhancement
  gren-lang/compiler#381 · Filter by author nsensfel opened on Jul 16, 2026

• Haskell-based compiler 0.6.5 crashes when compiling a package that has a summary field >= 80 chars

  buggood first issuehelp wanted
  gren-lang/compiler#380 · Filter by author gilramir opened on Jun 28, 2026

• Bytes field in record becomes undefined when used as Flags

  Bug

  gren-lang/compiler#376 · Filter by author robinheghan opened on Jun 8, 2026

• Discussion: formatting options

  gren-lang/compiler#374 · Filter by author gilramir opened on May 27, 2026
  5

• Custom platforms

  language proposal
  gren-lang/compiler#373 · Filter by author robinheghan opened on May 20, 2026

• Getting rid of effect modules and ports

  language proposal
  gren-lang/compiler#372 · Filter by author robinheghan opened on May 19, 2026

• Transparent tasks and commands

  language proposal
  gren-lang/compiler#371 · Filter by author robinheghan opened on May 19, 2026

• gren run should support --optimize

  gren-lang/compiler#369 · Filter by author robinheghan opened on Apr 20, 2026

• Unclear error for two doc comments for a declaration

  error message
  gren-lang/compiler#366 · Filter by author robinheghan opened on Mar 16, 2026

• Closures in recursive calls get shadowed, causing stack overflows

  bug
  gren-lang/compiler#365 · Filter by author robinheghan opened on Feb 16, 2026

• Proposal: Add BigInt support to Gren for correct 64-bit integers and future-proof interop

  gren-lang/compiler#364 · Filter by author sldab opened on Feb 6, 2026
  2

• Feature request: add gren_packages/ to .gitignore by default when gren init

  gren-lang/compiler#353 · Filter by author alpineyahoo opened on Sep 23, 2025
  2

• Minor race condition in line order of compiler error output

  bug
  gren-lang/compiler#352 · Filter by author aramiscd opened on Sep 13, 2025
  4

• gren make —optimize doesn’t error on Debug module

  gren-lang/compiler#349 · Filter by author robinheghan opened on Aug 30, 2025
  1

• gren run should spawn the program with the same node process

  enhancement
  gren-lang/compiler#347 · Filter by author robinheghan opened on Aug 4, 2025

• Improve context of error messages

  enhancement
  gren-lang/compiler#340 · Filter by author robinheghan opened on Jul 31, 2025

• Include the packages that causes the version conflict in the error message

  enhancement
  gren-lang/compiler#320 · Filter by author robinheghan opened on Jul 25, 2025