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manuscript
Simple enough for AI to write. Clear enough for humans to review. Easy enough for computers to verify.

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`String.upper()` / `lower()` use per-scalar simple case mapping: `"ß".upper()` is `ß`, `"ΑΣ".lower()` ends in `σ`, `"İ".lower()` is `i`, and the docs say nothing
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Difficulty 2/5 1-3 hours Newbie friendliness 69/100

manuscript-lang/manuscript#198 · 1 comment · Opened Oct 13, 2026

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`with x = open()` where `open` returns a Result/Optional suggests `impl Closeable for Result[R, String]`, which the compiler then rejects; the fix is `try` or `match`
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Difficulty 3/5 1-2 days Newbie friendliness 68/100

manuscript-lang/manuscript#193 · Opened Oct 13, 2026

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Diagnostic paper cuts: `Synchronized.value` is "unknown" yet listed as available, identical errors printed twice, and a bogus second error after a reserved type name
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Difficulty 4/5 3-5 days Newbie friendliness 48/100

manuscript-lang/manuscript#192 · Opened Oct 13, 2026

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Generic inference fails to widen a Result error to Error: `h(r: f())` is rejected with "conflicting generic inference" but `h[Int](r: f())` works
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Difficulty 4/5 3-5 days Newbie friendliness 52/100

manuscript-lang/manuscript#191 · Opened Oct 13, 2026

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Decimal cannot be rounded or printed with fixed places: `25.50d` prints `25.5` and `19.99d * 3d * 0.0825d` stays `4.947525`, so money programs cannot show cents
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Difficulty 5/5 Over a week Newbie friendliness 45/100

manuscript-lang/manuscript#190 · Opened Oct 13, 2026

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Literal braces in a string (JSON, Go/CSS snippets): the diagnostic points at the closing quote and only mentions `\}`, so escaping the opening `{` first still fails
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Difficulty 2/5 1-3 hours Newbie friendliness 66/100

manuscript-lang/manuscript#189 · Opened Oct 13, 2026

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"unknown or ambiguous member" hides the right name: the `available:` list is cut at 12 alphabetical entries and there are no suggestions for `length`, `len`, `push`, `join` on non-String lists
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in progress

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

manuscript-lang/manuscript#188 · 1 comment · Opened Oct 13, 2026

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Forgetting `import List`/`Map` cost 4 of 44 programs a retry; one missing import yields up to 4 diagnostics, two of them wrong
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Difficulty 4/5 3-5 days Newbie friendliness 45/100

manuscript-lang/manuscript#187 · 2 comments · Opened Oct 13, 2026

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`ms profile` slows call-heavy programs about 100x and writes a 760 MB `trace.out` for a program that runs in 0.35 s
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Difficulty 4/5 3-5 days Newbie friendliness 55/100

manuscript-lang/manuscript#186 · Opened Oct 13, 2026

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Performance: `for x in list` copies the whole list before the first iteration, so `for ...: return`/`break` on a large list is O(n) (1,000 calls on a 1M list take 15 s); Map loops allocate a Record plus a Go map per entry
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in progress performance

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

manuscript-lang/manuscript#185 · Opened Oct 13, 2026

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Missing argument labels caused 8 of 22 failed first attempts in an agent study; report one complete labeled call and drop the bogus "cannot infer T" error
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in progress

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

manuscript-lang/manuscript#184 · 1 comment · Opened Oct 13, 2026

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Performance: `try` propagates errors with a Go panic, so each failing call costs ~1.8 µs and unwinds through three deferred handlers per frame
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Difficulty 4/5 3-5 days Newbie friendliness 44/100

manuscript-lang/manuscript#183 · Opened Oct 13, 2026

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Performance: methods on built-in values (`list.length()`, `string.byte_length()`, ...) build a new function object on every call (~550 ns for a length)
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Difficulty 5/5 Over a week Newbie friendliness 38/100

manuscript-lang/manuscript#182 · Opened Oct 13, 2026

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Performance: calling a user method or an interface operation re-resolves the implementation on every call (`Bind` scans the registry and allocates three maps; about 900 ns per call)
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in progress performance

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

manuscript-lang/manuscript#181 · Opened Oct 13, 2026

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Performance: every call of a generic function re-runs `Specialize` (two maps plus a new closure), about 5x the cost of a plain call
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in progress performance

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

manuscript-lang/manuscript#180 · Opened Oct 13, 2026

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Performance: `return`, `break` and `continue` inside a statement `match` arm are lowered to Go panics (5x slower than the expression form)
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Difficulty 4/5 3-5 days Newbie friendliness 48/100

manuscript-lang/manuscript#179 · Opened Oct 13, 2026

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Performance: `==` / `!=` on Int, Float, String, Bool lowers to the generic `Equality` and scans every registered implementation (a loop with one `i % 3 == 0` is 4.6x slower than `< 1`)
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Difficulty 4/5 3-5 days Newbie friendliness 48/100

manuscript-lang/manuscript#178 · 1 comment · Opened Oct 13, 2026

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Standard-library docs lag behind declarations: many methods appear only in the generated reference, and `Bytes.values` is documented as a field that does not work
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Difficulty 4/5 3-5 days Newbie friendliness 48/100

manuscript-lang/manuscript#176 · Opened Oct 13, 2026

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CLI flags and arguments are not uniform across commands: input arity, directory support, `--json`, `--debug`, `-o` meaning, `--flag=value`, `ms stdlib` vs `ms doc --stdlib`
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Difficulty 5/5 Over a week Newbie friendliness 35/100

manuscript-lang/manuscript#175 · Opened Oct 13, 2026

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Overlapping host APIs and error types: env/cwd/temp dir in four modules, `io.File` vs `FileHandle`, `write` returns `Unit` vs `Int`, near-identical `*Error` enums with drifting cases
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Difficulty 5/5 Over a week Newbie friendliness 25/100

manuscript-lang/manuscript#174 · Opened Oct 13, 2026

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Defaults and limits are inconsistent: required `Bool`/options with no default, `Limits` records vs inline `max_*` parameters, and five names for "max bytes"
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Difficulty 5/5 Over a week Newbie friendliness 35/100

manuscript-lang/manuscript#173 · Opened Oct 13, 2026

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Typed-looking APIs take `String`/`Int` where an alternative or `Duration` exists: open flags, signals, hash/compression formats, `clone`/`overflow` policies, microsecond counters
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Difficulty 5/5 Over a week Newbie friendliness 25/100

manuscript-lang/manuscript#172 · Opened Oct 13, 2026

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HTTP/network API is inconsistent: five header representations, `request` vs `send` return different types, `limit` vs `max_requests`, mixed IoError/HttpError, `parse_ip` returns `String`
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Difficulty 5/5 Over a week Newbie friendliness 35/100

manuscript-lang/manuscript#171 · Opened Oct 13, 2026

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No single policy for failure: the same kind of mistake returns `Optional`, returns `Result`, clamps, or faults depending on the API (and some fault messages are not actionable)
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Difficulty 5/5 Over a week Newbie friendliness 25/100

manuscript-lang/manuscript#168 · Opened Oct 13, 2026

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Naming and parameter labels drift across the standard library: `toString` vs `to_string`, `right`/`other`/`values` for "the other operand", `replace` vs `replace_all`, `parse`/`format`/`stringify`
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Difficulty 5/5 Over a week Newbie friendliness 25/100

manuscript-lang/manuscript#167 · Opened Oct 13, 2026

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Parallel APIs have obvious gaps: `Result` has no operations, `Optional` has no `map`, `Map`/`Set` have no `is_empty` or `filter`, `Set` has no `map`, no counterpart for `String`/`Bytes`/`List` basics
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Difficulty 5/5 Over a week Newbie friendliness 25/100

manuscript-lang/manuscript#166 · Opened Oct 13, 2026

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Copy-vs-mutate is unpredictable from names: `with_value`/`without`/`reverse`/`concat` mutate or copy depending on the type, and `with_value` means three different things
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Difficulty 5/5 Over a week Newbie friendliness 35/100

manuscript-lang/manuscript#165 · Opened Oct 13, 2026

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Docs have no complete first-task programs: no hello world with output helper, no "read a text file", no "HTTP GET", no "read stdin lines" recipe (only fragments)
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Difficulty 3/5 1-2 days Newbie friendliness 57/100

manuscript-lang/manuscript#162 · 1 comment · Opened Oct 13, 2026

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Starting a new project: no `ms init`/`ms new` (and `ms init` suggests "Did you mean 'ms lint'?"); `ms run` silently creates ms.lock and a 10 MB `.ms-cache/` with no .gitignore guidance
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Difficulty 5/5 Over a week Newbie friendliness 35/100

manuscript-lang/manuscript#161 · Opened Oct 13, 2026

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Methods are undiscoverable: the tour never mentions `impl`/interfaces, `impl T:` fails with "expected 'for'", and `value.f()` on a free function gives no hint
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Difficulty 4/5 3-5 days Newbie friendliness 42/100

manuscript-lang/manuscript#160 · Opened Oct 13, 2026

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No documented way to loop N times: `range` is never mentioned outside the reference, needs a `step`, returns a Result, and `for i in range(...)` errors cascade
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Difficulty 4/5 3-5 days Newbie friendliness 48/100

manuscript-lang/manuscript#159 · Opened Oct 13, 2026

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Forgetting `import Map` / `Set` gives a misleading "brackets require type arguments" error (and junk cascade errors)
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in progress

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

manuscript-lang/manuscript#158 · Opened Oct 13, 2026

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Newcomer testing: no assert/expect, no user-facing testing guide, and `assert x == y` fails with a generic parse error
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Difficulty 5/5 Over a week Newbie friendliness 42/100

manuscript-lang/manuscript#157 · Opened Oct 13, 2026

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Assigning to an existing function, type, case or import reports "unknown binding" (and suggests importing a name that is already imported)
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Difficulty 3/5 1-2 days Newbie friendliness 67/100

manuscript-lang/manuscript#155 · Opened Oct 13, 2026

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Graceful shutdown on SIGTERM/SIGINT: code after `watch_signals().next()` races with cancellation and usually never runs; the supported idiom is undocumented
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Difficulty 3/5 1-2 days Newbie friendliness 48/100

manuscript-lang/manuscript#149 · Opened Oct 13, 2026

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A task that waits for a `Synchronized` lock its parent holds faults instead of waiting, and whether it faults depends on timing
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Difficulty 5/5 Over a week Newbie friendliness 35/100

manuscript-lang/manuscript#148 · Opened Oct 13, 2026

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Large list literals make native builds superlinear (16,000 ints: 72 s; 100,000: over 200 s) and deeply nested literals make `ms check` cubic
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Difficulty 5/5 Over a week Newbie friendliness 35/100

manuscript-lang/manuscript#147 · Opened Oct 13, 2026

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`slice` has four different out-of-range behaviors across String, List and Bytes, and String.slice/substring are undocumented (negative and out-of-range indexes silently clamp)
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Difficulty 5/5 Over a week Newbie friendliness 45/100

manuscript-lang/manuscript#143 · Opened Oct 13, 2026

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`List[Int]` costs ~80 bytes per element (4M ints = 325 MB peak RSS); `append` ~1.5 µs, `sorted` 7 µs/element
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Difficulty 5/5 Over a week Newbie friendliness 35/100

manuscript-lang/manuscript#142 · Opened Oct 13, 2026

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Diagnostics: `pass` and `if`/`else` used as an expression get a generic parse error with no hint (use `unit` / assign in branches)
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Difficulty 3/5 1-2 days Newbie friendliness 68/100

manuscript-lang/manuscript#141 · Opened Oct 13, 2026

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Golden-file tests cannot find their fixtures: `ms test` resolves relative paths against the caller's directory and there is no way to ask for the project or test-file directory
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Difficulty 4/5 3-5 days Newbie friendliness 55/100

manuscript-lang/manuscript#140 · Opened Oct 13, 2026

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`HttpRequest.path` is fully percent-decoded (`%2F` becomes `/`, `%2e%2e` becomes `..`, `%00` becomes NUL), so handlers cannot route safely; transport errors leak Go text
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Difficulty 5/5 Over a week Newbie friendliness 35/100

manuscript-lang/manuscript#137 · 1 comment · Opened Oct 13, 2026

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TOML and YAML parse errors report wrong positions: control characters always at 1:1, YAML merge/block-header errors one line late, `True`/`yes` say "invalid exponent"
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Difficulty 4/5 3-5 days Newbie friendliness 52/100

manuscript-lang/manuscript#136 · Opened Oct 13, 2026

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Negative `max_parts` / `max_replacements` fault with "invalid optional limit or timeout" instead of returning an error; `"".split(...)` returns zero parts
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Difficulty 4/5 3-5 days Newbie friendliness 48/100

manuscript-lang/manuscript#135 · Opened Oct 13, 2026

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YAML parser silently returns wrong text for blank lines inside folded (`>`) and quoted scalars, and rejects them in plain scalars
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Difficulty 4/5 3-5 days Newbie friendliness 55/100

manuscript-lang/manuscript#133 · Opened Oct 13, 2026

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`csv.stringify` writes `[[""]]` as a bare newline, which `csv.parse` drops, so single-column rows with an empty cell vanish on round trip
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Difficulty 3/5 Half a day Newbie friendliness 57/100

manuscript-lang/manuscript#132 · Opened Oct 13, 2026

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A `match` statement whose first arm ends in a non-Unit call (e.g. `list.with_value(...)`) fails with "match arm requires a final value", pointing at the other arm
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Difficulty 4/5 1-2 days Newbie friendliness 55/100

manuscript-lang/manuscript#130 · 1 comment · Opened Oct 13, 2026

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Diagnostics: nested patterns, a binding catch-all arm, and a non-Unit last statement in a match arm all give misleading messages
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in progress

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

manuscript-lang/manuscript#127 · 1 comment · Opened Oct 13, 2026

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A type parameter named `Equal` or `Hashable` is accepted, contrary to generics.md, and leads to a confusing error
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Difficulty 3/5 1-2 days Newbie friendliness 68/100

manuscript-lang/manuscript#126 · Opened Oct 13, 2026

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No way to share a Manuscript package between two projects: aliases cannot leave the project root, a library project needs a fake `main`, and the error has no position
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Difficulty 5/5 Over a week Newbie friendliness 38/100

manuscript-lang/manuscript#121 · Opened Oct 13, 2026

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