Issues

• Better error messages for failed subeffect constraints

  flix/flix#13587 · Filter by author magnus-madsen opened on Oct 23, 2026

• Effect lock: three package changes that eff-check does not see

  bug
  flix/flix#13504 · Filter by author magnus-madsen opened on Oct 13, 2026

• Backend: redundant passing, casting and unboxing of Unit

  A: codegen
  flix/flix#13479 · Filter by author magnus-madsen opened on Oct 8, 2026

• Debug effect is not declared in its companion

  flix/flix#13476 · Filter by author magnus-madsen opened on Oct 6, 2026

• Multi-shot handler resuming across a region boundary does not restore region state

  bug
  flix/flix#13459 · Filter by author amistozy opened on Oct 1, 2026
  1

• A module at depth two with an undeclared parent is accepted, but cannot be reached

  flix/flix#13447 · Filter by author magnus-madsen opened on Sep 29, 2026

• Ill-typed signature?

  bug
  flix/flix#13428 · Filter by author magnus-madsen opened on Sep 29, 2026

• Compiler output is non-deterministic under parallel compilation

  flix/flix#13386 · Filter by author magnus-madsen opened on Sep 21, 2026

• Add a --locked flag that refuses a file packages.lock has no digest for

  flix/flix#13338 · Filter by author magnus-madsen opened on Sep 19, 2026

• Monomorphization crashes when a polymorphic effect's type argument is bound only through a trait constraint

  bug
  flix/flix#13254 · Filter by author magnus-madsen opened on Sep 10, 2026

• Monomorphize polymorphic effects before JVM lowering

  flix/flix#13247 · Filter by author magnus-madsen opened on Sep 10, 2026

• Record type-argument position in provenance to report nested type mismatches precisely

  flix/flix#13174 · Filter by author magnus-madsen opened on Sep 2, 2026

• Open questions in relation to constraint-based monomorphization replacing the demand-driven one

  flix/flix#13159 · Filter by author Simon220902 opened on Aug 28, 2026
  1

• Move Datalog query-select desugaring out of desugarer

  flix/flix#13058 · Filter by author mlutze opened on Aug 18, 2026

• No IDE debugging support (breakpoints, stepping, variable inspection) for compiled Flix programs

  flix/flix#13057 · Filter by author wstein opened on Aug 18, 2026
  1

• Crash in Kinder on duplicate trait declarations with different signatures

  bug
  flix/flix#13039 · Filter by author magnus-madsen opened on Aug 16, 2026

• Remove PickException from Weeder2

  flix/flix#13033 · Filter by author magnus-madsen opened on Aug 16, 2026
  2

• Datalog select-clause terms are silently unconstrained by the type checker

  bug
  flix/flix#13015 · Filter by author Simon220902 opened on Aug 14, 2026
  2

• Use Nel in compiler

  flix/flix#13009 · Filter by author mlutze opened on Aug 13, 2026
  

• Self-contained flix toolchain: manage the JDK and pin/fetch the compiler version like Go's go.mod toolchain

  flix/flix#13003 · Filter by author chengjilai opened on Aug 10, 2026
  1

• Tail recursion when using pipeline operator |>

  flix/flix#12978 · Filter by author Blackmorse opened on Aug 1, 2026
  4

• Java interop boundary: anonymous class parameters and super call arguments are not bridged between Java and Flix types

  flix/flix#12972 · Filter by author mlutze opened on Jul 31, 2026

• Follow-up on Monomorphization

  flix/flix#12968 · Filter by author magnus-madsen opened on Jul 29, 2026
  1

• increment-assign for Refs

  flix/flix#12953 · Filter by author mlutze opened on Jul 27, 2026

• NonEmptySet

  flix/flix#12951 · Filter by author mlutze opened on Jul 27, 2026
  7