Hacktoberfest 2026: the issues maintainers tagged for October, open and beginner-friendly. Browse Hacktoberfest issues

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  • Windows installation defective
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 15/100

    koka-lang/koka#958 · 1 comment ·

    Maintainers usually reply within 2 days

  • kklib: marking a large vector as thread-shared at depth >= 100 overflows the stack
    Open

    Difficulty 2/5 1-3 hours Newbie friendliness 72/100

    koka-lang/koka#956 ·

    Maintainers usually reply within 2 days

  • REPL spins at 100% CPU with growing memory and ignores SIGTERM/SIGHUP after its terminal closes
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 48/100

    koka-lang/koka#943 ·

    Maintainers usually reply within 2 days

  • Mimalloc crash when using paths returned by list-directory inside a parallel task
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 44/100

    koka-lang/koka#942 · 1 reaction ·

    Maintainers usually reply within 2 days

  • std/async: nested firstof cancels the sibling strand of the outer firstof
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 62/100

    koka-lang/koka#941 · 1 comment ·

    Maintainers usually reply within 2 days

  • Constructors with 128+ fields use mimalloc's small-object path (assertion in debug, out-of-bounds at -O2)
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 42/100

    koka-lang/koka#938 ·

    Maintainers usually reply within 2 days

  • [BUG] (strong-random / pseudo-random) inside a handler operation crashes the Koka 3.2.3 runtime.
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 58/100

    koka-lang/koka#931 · 1 comment ·

    Maintainers usually reply within 2 days

  • Internal error: `Type.TypeVar.subNew.KindMismatch` on a recursive function with `E` type parameter before `H`
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 55/100

    koka-lang/koka#930 ·

    Maintainers usually reply within 2 days

  • [LSP] Stale diagnostics persist after errors are fixed
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 57/100

    koka-lang/koka#929 · 1 reaction ·

    Maintainers usually reply within 2 days

  • Effect type error for tmap-fip.
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 45/100

    koka-lang/koka#926 ·

    Maintainers usually reply within 2 days

  • JS backend miscompiles tail-recursive match in balance-red, producing undefined values
    May be free again A pull request for this issue was closed without being merged. Open

    Difficulty 4/5 3-5 days Newbie friendliness 68/100

    koka-lang/koka#925 · 1 comment ·

    Maintainers usually reply within 2 days

  • Weird interactions between implicits and named arguments
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 45/100

    koka-lang/koka#912 ·

    Maintainers usually reply within 2 days

  • Memory leak in string join
    Open
    fixed-on-dev

    Difficulty 3/5 1-2 days Newbie friendliness 52/100

    koka-lang/koka#903 ·

    Maintainers usually reply within 2 days

  • Some amount of scalar arguments cause compiler hang
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 48/100

    koka-lang/koka#891 · 2 comments ·

    Maintainers usually reply within 2 days

  • use of undeclared identifier
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 45/100

    koka-lang/koka#889 ·

    Maintainers usually reply within 2 days

  • Recursive default argument causes effect inference failure (`effects do not match`)
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 48/100

    koka-lang/koka#888 ·

    Maintainers usually reply within 2 days

  • Allow specifying generic types at callsite?
    Open

    Difficulty 5/5 Over a week Newbie friendliness 30/100

    koka-lang/koka#887 ·

    Maintainers usually reply within 2 days

  • Capture-avoiding substitution for forall types
    Open

    Difficulty 5/5 Over a week Newbie friendliness 28/100

    koka-lang/koka#872 ·

    Maintainers usually reply within 2 days

  • NbE workload
    Open

    Difficulty 5/5 Over a week Newbie friendliness 25/100

    koka-lang/koka#869 · 1 reaction ·

    Maintainers usually reply within 2 days

  • Rename `error<a>` to `result<a>`
    Open

    Difficulty 5/5 Over a week Newbie friendliness 35/100

    koka-lang/koka#867 · 1 comment · 2 reactions ·

    Maintainers usually reply within 2 days

  • Recursion on two inductive values is spuriously found divergent sometimes
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 45/100

    koka-lang/koka#862 ·

    Maintainers usually reply within 2 days

  • Naming clash not reported between effect function and regular function
    Open

    Difficulty 3/5 1-2 days Newbie friendliness 48/100

    koka-lang/koka#861 ·

    Maintainers usually reply within 2 days

  • Match completeness misses simple cases
    Open
    bug

    Difficulty 4/5 3-5 days Newbie friendliness 42/100

    koka-lang/koka#858 · 3 comments ·

    Maintainers usually reply within 2 days

  • Effect widening doesn't occur for effect parameters
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 35/100

    koka-lang/koka#857 · 1 comment ·

    Maintainers usually reply within 2 days

  • Type aliases should not be expanded when containing phantom type parameters.
    Open
    bug

    Difficulty 5/5 Over a week Newbie friendliness 35/100

    koka-lang/koka#850 ·

    Maintainers usually reply within 2 days

  • Broken `some` inference
    Open

    Difficulty 5/5 Over a week Newbie friendliness 25/100

    koka-lang/koka#847 · 1 comment ·

    Maintainers usually reply within 2 days

  • Can't reference a private type alias in another module
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 42/100

    koka-lang/koka#846 ·

    Maintainers usually reply within 2 days

  • Publish VS Code extension to Open VSX
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 45/100

    koka-lang/koka#844 · 3 reactions ·

    Maintainers usually reply within 2 days

  • FFI documentation
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 30/100

    koka-lang/koka#843 ·

    Maintainers usually reply within 2 days

  • Error on C backend when recursively assembling string
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 35/100

    koka-lang/koka#832 · 1 comment ·

    Maintainers usually reply within 2 days

  • Partial function application syntax
    Open

    Difficulty 5/5 Over a week Newbie friendliness 35/100

    koka-lang/koka#829 · 4 comments ·

    Maintainers usually reply within 2 days

  • Tab characters are illegal in string literals?
    Open

    Difficulty 3/5 1-2 days Newbie friendliness 48/100

    koka-lang/koka#822 · 1 comment ·

    Maintainers usually reply within 2 days

  • Forbidden identifier "postfix"?
    Open

    Difficulty 3/5 1-2 days Newbie friendliness 45/100

    koka-lang/koka#820 · 1 comment ·

    Maintainers usually reply within 2 days

  • Unexpected output encoding
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 35/100

    koka-lang/koka#819 · 1 comment ·

    Maintainers usually reply within 2 days

  • Point-free composition triggers effect mismatch; point-wise function does not
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 35/100

    koka-lang/koka#818 · 3 comments ·

    Maintainers usually reply within 2 days

  • implicit not inferred based on explicitly passed argument
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 35/100

    koka-lang/koka#814 · 1 comment ·

    Maintainers usually reply within 2 days

  • Missing documentation for pattern matching and extensible data types
    Open

    Difficulty 3/5 1-2 days Newbie friendliness 38/100

    koka-lang/koka#812 · 1 comment ·

    Maintainers usually reply within 2 days

  • kind mismatch on ref show function
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 35/100

    koka-lang/koka#811 ·

    Maintainers usually reply within 2 days

  • [LSP] diagnostics not getting through when file is accessed through symlink
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 35/100

    koka-lang/koka#810 · 1 comment ·

    Maintainers usually reply within 2 days

  • There should be an warning if an implicit is unused.
    Open
    error-messages types

    Difficulty 4/5 3-5 days Newbie friendliness 35/100

    koka-lang/koka#808 · 1 comment ·

    Maintainers usually reply within 2 days

  • Incorrect behavior of (==) for moderately large integers (with C backend)
    Open
    bug c-backend

    Difficulty 3/5 1-2 days Newbie friendliness 45/100

    koka-lang/koka#807 ·

    Maintainers usually reply within 2 days

  • Effect `exn` breaks transitive imports
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 35/100

    koka-lang/koka#802 · 1 comment ·

    Maintainers usually reply within 2 days

  • Can't use "prefix" as a parameter name
    Open

    Difficulty 3/5 1-2 days Newbie friendliness 45/100

    koka-lang/koka#796 ·

    Maintainers usually reply within 2 days

  • Recompilation fails when a module exports a forward slash
    Open

    Difficulty 3/5 1-2 days Newbie friendliness 55/100

    koka-lang/koka#794 ·

    Maintainers usually reply within 2 days

  • Koka doesn't recompile a module if an included file changes
    Open
    bug-has-workaround

    Difficulty 3/5 1-2 days Newbie friendliness 45/100

    koka-lang/koka#793 · 1 comment ·

    Maintainers usually reply within 2 days

  • Please consider snap packaging for Linux
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 35/100

    koka-lang/koka#792 · 1 comment · 1 reaction ·

    Maintainers usually reply within 2 days

  • Submodules within files
    Open

    Difficulty 5/5 Over a week Newbie friendliness 25/100

    koka-lang/koka#790 ·

    Maintainers usually reply within 2 days

  • Internal error when using `'a' + char(1)` directly in `print`
    Open
    crash

    Difficulty 3/5 1-2 days Newbie friendliness 48/100

    koka-lang/koka#789 · 1 comment ·

    Maintainers usually reply within 2 days

  • Named effect escaping
    Open

    Difficulty 5/5 Over a week Newbie friendliness 20/100

    koka-lang/koka#788 · 14 comments ·

    Maintainers usually reply within 2 days

  • Target Koka's untyped intermediate language
    Open

    Difficulty 5/5 Over a week Newbie friendliness 20/100

    koka-lang/koka#786 · 8 comments ·

    Maintainers usually reply within 2 days

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