FujoJTOP/loment

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Loment — a systems programming language. Compiles to native x86-64 (Linux ELF, Windows PE, or freestanding for bare metal) with no runtime and no libc. The toolchain is itself written in Loment; source can be written in its Rust-flavored base syntax or six more: C, C++, Java, C#, Go, Python.

Is FujoJTOP/loment beginner-friendly?

The maintainers of FujoJTOP/loment usually reply to a pull request within 1 day. 7 beginner-friendly issues are open now.

Stars: 5
Forks: 5
Open beginner issues: 7
Indexed issues: 98
Avg merge: 5h 10m
Merged PRs (30d): 125

Dominant language: Rust
License: No license data
Last GitHub push: Oct 10, 2026
Latest indexed: Oct 10, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted good first issue hacktoberfest

How to contribute to FujoJTOP/loment

Read the contributing guide first: it says how the maintainers want changes proposed, tested and reviewed.
Read its code of conduct: it covers issues and pull requests as well as chat.
Pick one of the 7 open beginner-friendly issues below and comment that you want to work on it before you start.

Beginner friendly Everything

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Issues somebody may already be working on are listed last. List everything by date

`grammar python`: a `bool` parameter can never be called — call sites force `i64` (tools/pytrans.py:278)
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 58/100

FujoJTOP/loment#218 · Opened Oct 11, 2026

Maintainers usually reply within 1 day
A parameter named like a module `const` is reported as `函数 f 参数 K 重复` (E013) — the parameter is not duplicated
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 38/100

FujoJTOP/loment#217 · Opened Oct 11, 2026

Maintainers usually reply within 1 day
A function-local `let` that shadows a module `const` is silently ignored (the const wins; check reports OK)
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 35/100

FujoJTOP/loment#216 · Opened Oct 11, 2026

Maintainers usually reply within 1 day
lomentc: pointer comparison emits `icmp == ptr` (invalid LLVM)
Open
- Is something wrong?
Difficulty 2/5 1-3 hours Newbie friendliness 72/100

FujoJTOP/loment#205 · Opened Oct 10, 2026

Maintainers usually reply within 1 day
The guards count counts post-monomorphisation instances on the Python side but source tokens in selfhost, so a generic+guard unit yields two different form objects
Open
- Is something wrong?
ai-agent-friendly bug easy

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

FujoJTOP/loment#169 · Opened Oct 9, 2026

Maintainers usually reply within 1 day
Dependency paths resolve with no containment check: use "..." and pkg.json path can read (and hash) outside the project
Open
- Is something wrong?
ai-agent-friendly bug help wanted

Difficulty 4/5 1-2 days Newbie friendliness 28/100

FujoJTOP/loment#168 · Opened Oct 9, 2026

Maintainers usually reply within 1 day
lomelf takes e_shstrndx, section nameoff and link straight from the input object with no bounds check, so a malformed .o/.a aborts the compiler with a traceback
Open
- Is something wrong?
ai-agent-friendly bug easy

Difficulty 3/5 1-2 days Newbie friendliness 66/100

FujoJTOP/loment#167 · Opened Oct 9, 2026

Maintainers usually reply within 1 day
VS Code extension declares no untrusted-workspace capability while exposing command+args settings (serverCommand/toolCommand/dapCommand) that a workspace setting can override
Open
- Is something wrong?
ai-agent-friendly bug easy

Difficulty 3/5 Half a day Newbie friendliness 42/100

FujoJTOP/loment#166 · Opened Oct 9, 2026

Maintainers usually reply within 1 day
The Rust backend lowers `free` to a no-op, so the same source reclaims memory natively and leaks on the Rust target (and diverges from the IR backend)
Open
- Is something wrong?
ai-agent-friendly bug easy

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

FujoJTOP/loment#165 · Opened Oct 9, 2026

Maintainers usually reply within 1 day
`free` checks neither ownership nor double-free: freeing twice puts one region both at the frontier and on the free list, so two live allocations alias
Open
- Is something wrong?
ai-agent-friendly bug help wanted

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

FujoJTOP/loment#164 · Opened Oct 9, 2026

Maintainers usually reply within 1 day
lompi silently truncates any source file larger than PKG_FILE_MAX: the content-hash identity covers only the first 256 KiB, and the docstring promises it refuses instead
Open
- Is something wrong?
ai-agent-friendly bug good first issue

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

FujoJTOP/loment#163 · Opened Oct 9, 2026

Maintainers usually reply within 1 day
Rust backend increments the capability audit BEFORE the bounds check, so an out-of-domain index has a side effect (and diverges from the IR backend)
Open
- Is something wrong?
ai-agent-friendly bug easy good first issue

Difficulty 3/5 1-2 days Newbie friendliness 50/100

FujoJTOP/loment#162 · Opened Oct 9, 2026

Maintainers usually reply within 1 day
guard resolution uses the ROOT unit capability table for every module, so a `use`d library own guard is resolved against the consumer domains
Open
- Is something wrong?
ai-agent-friendly bug help wanted

Difficulty 4/5 3-5 days Newbie friendliness 22/100

FujoJTOP/loment#161 · Opened Oct 9, 2026

Maintainers usually reply within 1 day
Capability audit table is `[16]` but `cap_id` is unbounded: declaring 17+ capabilities makes a passing guard write 8 bytes out of bounds
Open
- Is something wrong?
ai-agent-friendly bug easy good first issue

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

FujoJTOP/loment#160 · Opened Oct 9, 2026

Maintainers usually reply within 1 day
lomt_from.py splices artifact strings into source without escaping: a form object can declare arbitrary top-level code (`excluded`, potato -> .lomt)
Open
- Is something wrong?
ai-agent-friendly bug good first issue

Difficulty 3/5 1-2 days Newbie friendliness 62/100

FujoJTOP/loment#159 · Opened Oct 9, 2026

Maintainers usually reply within 1 day
check does not check the bodies of modules brought in by `use`, so a library can ship with a body type error and every consumer checks clean (docs/198 §4, re-verified unfixed)
Open
- Is something wrong?
bug help wanted

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

FujoJTOP/loment#149 · Opened Sep 25, 2026

Maintainers usually reply within 1 day
selfhost `loment doc` accepts a file with a grammar declaration, names the module `grammar` and drops every function — exit 0 — while `check` refuses the same file
Open
- Is something wrong?
bug

Difficulty 3/5 Half a day Newbie friendliness 42/100

FujoJTOP/loment#144 · Opened Sep 25, 2026

Maintainers usually reply within 1 day
Cross-module duplicate symbol: the message says the function collides "with module ma", naming a module instead of the other module that also emits it
Open
- Is something wrong?
bug

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

FujoJTOP/loment#141 · 1 comment · Opened Sep 25, 2026

Maintainers usually reply within 1 day
Two files that both declare `module same` pass check and build with "0 failed", then produce IR with two `define i32 @f` and a raw ElfError in the linker
Open
- Is something wrong?
bug

Difficulty 3/5 Half a day Newbie friendliness 62/100

FujoJTOP/loment#139 · Opened Sep 25, 2026

Maintainers usually reply within 1 day
choose write grammar c: mixed int/long arithmetic gives a result that depends on operand order — `x + y == 2147483648` and `x + y < 0` are both true
Open
- Is something wrong?
bug

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

FujoJTOP/loment#133 · Opened Sep 25, 2026

Maintainers usually reply within 1 day
choose write grammar c: an integer literal wider than 32 bits is emitted as-is and wraps silently, turning `0x1FFFFFFFF == 0xFFFFFFFF` into true
Open
- Is something wrong?
bug

Difficulty 3/5 1-2 days Newbie friendliness 50/100

FujoJTOP/loment#132 · Opened Sep 25, 2026

Maintainers usually reply within 1 day
choose write grammar c: a comparison against a negative literal is evaluated unsigned, so `-1 < 0` is false and `-1 == -1` is true in the same unit
Open
- Is something wrong?
bug

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

FujoJTOP/loment#131 · 1 comment · Opened Sep 25, 2026

Maintainers usually reply within 1 day
choose write grammar c: no integer conversion exists at any site and the cast is out of subset, so a unit can only use one integer type
Open
- Is something wrong?
bug help wanted

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

FujoJTOP/loment#125 · Opened Sep 25, 2026

Maintainers usually reply within 1 day
choose write grammar c: mixed int/unsigned expressions are emitted unchanged, so the program computes the signed interpretation (C says 7, the unit says 8)
Open
- Is something wrong?
bug

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

FujoJTOP/loment#123 · Opened Sep 25, 2026

Maintainers usually reply within 1 day
choose write grammar c: a `use` line inside the unit is silently discarded (not in the product, not in skipped)
Open
- Is something wrong?
bug

Difficulty 3/5 Half a day Newbie friendliness 42/100

FujoJTOP/loment#121 · Opened Sep 25, 2026

Maintainers usually reply within 1 day
choose write grammar c: block scope is not preserved; a declaration inside an if/while body rebinds the outer name and the program computes a different number
Open
- Is something wrong?
bug help wanted

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

FujoJTOP/loment#120 · 1 comment · Opened Sep 25, 2026

Maintainers usually reply within 1 day
Loment 0.1.4 Windows: setup.exe installs nothing — AppLaunched calls install.cmd by bare filename
Open
- Is something wrong?
bug

Difficulty 2/5 1-3 hours Newbie friendliness 20/100

FujoJTOP/loment#117 · 1 comment · Opened Sep 25, 2026

Maintainers usually reply within 1 day
selfhost lomelf mirror: SIGILL on a module-level `i64` global (crashes instead of refusing)
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 35/100

FujoJTOP/loment#102 · Opened Sep 23, 2026

Maintainers usually reply within 1 day
grammar rust: no reassignment is expressible in the intersection of Rust and this grammar, so no stateful loop is
Open
- Is something wrong?
bug

Difficulty 5/5 Over a week Newbie friendliness 18/100

FujoJTOP/loment#77 · Opened Sep 22, 2026

Maintainers usually reply within 1 day
choose write grammar python: a Python syntax error reaches the CLI as a raw traceback instead of [ERR]
Open
- Is something wrong?
bug

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

FujoJTOP/loment#76 · Opened Sep 22, 2026

Maintainers usually reply within 1 day
choose write grammar <g>: declarations the scanner does not recognise leave no trace (empty unit, check prints OK)
Open
- Is something wrong?
bug

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

FujoJTOP/loment#75 · 1 comment · Opened Sep 22, 2026

Maintainers usually reply within 1 day
L1 commands accept a .lom (L0) file: check invents errors, fmt prints nothing
Open
- Is something wrong?
bug help wanted up-for-grabs

Difficulty 3/5 Half a day Newbie friendliness 55/100

FujoJTOP/loment#57 · Opened Sep 22, 2026

Maintainers usually reply within 1 day
loment doc drops /// on struct fields and enum variants
Open
- Is something wrong?
bug help wanted up-for-grabs

Difficulty 3/5 1-2 days Newbie friendliness 66/100

FujoJTOP/loment#56 · Opened Sep 22, 2026

Maintainers usually reply within 1 day
LSP publishDiagnostics never carries the document version
Open
- Is something wrong?
ai-agent-friendly bug easy good first issue up-for-grabs

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

FujoJTOP/loment#53 · Opened Sep 22, 2026

Maintainers usually reply within 1 day
--json suggestions is empty for every error code tried, so the documented editor autofix never fires
Open
- Is something wrong?
bug help wanted up-for-grabs

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

FujoJTOP/loment#51 · Opened Sep 22, 2026

Maintainers usually reply within 1 day
loment check --json writes a plain-text line instead of a JSON object when a use name does not resolve
Open
- Is something wrong?
ai-agent-friendly bug easy good first issue up-for-grabs

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

FujoJTOP/loment#50 · Opened Sep 22, 2026

Maintainers usually reply within 1 day
An unrecognised character (@) is silently discarded in statement position
Open
- Is something wrong?
bug help wanted up-for-grabs

Difficulty 3/5 Half a day Newbie friendliness 62/100

FujoJTOP/loment#49 · Opened Sep 22, 2026

Maintainers usually reply within 1 day
loment check exits 0 and prints nothing for files that cannot be built
Open
- Is something wrong?
bug help wanted up-for-grabs

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

FujoJTOP/loment#48 · Opened Sep 22, 2026

Maintainers usually reply within 1 day
loment fmt splits `pub` onto its own line, separated from the item it modifies
Open
- Is something wrong?
ai-agent-friendly bug easy good first issue up-for-grabs

Difficulty 3/5 Half a day Newbie friendliness 62/100

FujoJTOP/loment#46 · Opened Sep 22, 2026

Maintainers usually reply within 1 day
loment fmt deletes every comment, so loment doc loses the documentation it was generated from
Open
- Is something wrong?
bug help wanted

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

FujoJTOP/loment#45 · 1 comment · Opened Sep 22, 2026

Maintainers usually reply within 1 day
About 400 levels of nested blocks in a source file crash the compiler with SIGSEGV - a 4 KB file, and no diagnostic
Open
- Is something wrong?
bug

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

FujoJTOP/loment#44 · Opened Sep 22, 2026

Maintainers usually reply within 1 day
The standard maps are floodable: an attacker who controls the keys forces quadratic work (120x measured at 700 keys, quadratic in the key count)
Open
- Is something wrong?
bug

Difficulty 5/5 Over a week Newbie friendliness 15/100

FujoJTOP/loment#43 · Opened Sep 22, 2026

Maintainers usually reply within 1 day
The p8 corpus globs the working directory, so an untracked file makes the gate report a compiler regression
Open
- Is something wrong?
ai-agent-friendly bug easy good first issue up-for-grabs

Difficulty 2/5 1-3 hours Newbie friendliness 62/100

FujoJTOP/loment#41 · Opened Sep 22, 2026

Maintainers usually reply within 1 day
A write to a socket whose peer has gone away terminates the process: SIGPIPE is not ignored, and the death is silent (exit 13)
Open
- Is something wrong?
bug

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

FujoJTOP/loment#40 · Opened Sep 22, 2026

Maintainers usually reply within 1 day
One stalled client takes the whole service out of service, and the guide says nothing about a read timeout (the primitive exists)
Open
- Is something wrong?
documentation

Difficulty 2/5 1-3 hours Newbie friendliness 42/100

FujoJTOP/loment#39 · Opened Sep 22, 2026

Maintainers usually reply within 1 day
`use std` takes 18 minutes and then dies with SIGILL, printing nothing
Open
- Is something wrong?
bug help wanted

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

FujoJTOP/loment#38 · Opened Sep 22, 2026

Maintainers usually reply within 1 day
fujoc-s: 打不开 <garbage>: a unit with imports loses most of its string-literal capacity, and the failure carries no diagnostic
Open
- Is something wrong?
bug

Difficulty 4/5 3-5 days Newbie friendliness 25/100

FujoJTOP/loment#37 · 1 comment · Opened Sep 22, 2026

Maintainers usually reply within 1 day
String literals have no escape for CR: "\r" compiles to the letter r, and unrecognised escapes are silently dropped
Open
- Is something wrong?
bug

Difficulty 3/5 1-2 days Newbie friendliness 62/100

FujoJTOP/loment#36 · 2 comments · Opened Sep 22, 2026

Maintainers usually reply within 1 day
Reference pages jam when a first-column entry is 10 or more wide (`* capabilitycapability …`)
Open
- Is something wrong?
ai-agent-friendly bug easy first-timers-only good first issue hacktoberfest help wanted up-for-grabs

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

FujoJTOP/loment#35 · Opened Sep 22, 2026

Maintainers usually reply within 1 day
`lompi index` cannot process this repo's own store, and reports the missing dependency under a name that does not exist
Open
- Is something wrong?
bug up-for-grabs

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

FujoJTOP/loment#34 · Opened Sep 22, 2026

Maintainers usually reply within 1 day

FujoJTOP/loment

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