Lisette a little language inspired by Rust that compiles to Go

🔴 match is not exhaustive ╭─[example.lis:4:3] 2 │ enum Severity { Low, High, Critical } 3 │ fn should_alert(s: Severity) -> bool { 4 │ match s { · ───┬─── · ╰── not all patterns covered 5 │ Severity.Low => false, 6 │ Severity.High => true, 7 │ } ╰──── help: Handle the missing case Severity.Critical , e.g. Severity.Critical => { ... }

🔴 nil is not supported ╭─[users.lis:3:12] 1 │ fn find(name: string) -> Option<User> { 2 │ if name.is_empty() { 3 │ return nil · ─┬─ · ╰── does not exist 4 │ } 5 │ db.lookup(name) 6 │ } ╰──── help: Absence is encoded with Option<T> in Lisette. Use None to represent absent values

🟡 Result is silently discarded ╭─[files.lis:7:3] 5 │ fn cleanup() -> Result<(), error> { 6 │ os.RemoveAll("cache_dir")? 7 │ os.Remove("temp.txt") · ──────────┬────────── · ╰── failure will go unnoticed 8 │ } ╰──── help: Handle this Result with ? or match , or explicitly discard it with let _ = ...

🟡 Private type Config in public API ╭─[config.lis:6:24] 5 │ struct Config { host: string, port: int } 6 │ pub fn new_config() -> Config { · ───┬── · ╰── private 7 │ Config { host: "localhost", port: 8080 } ╰──── help: Config is private but exposed by new_config , which is public. Add pub to the private type or remove it from the public API

🔴 Immutable argument passed to mut parameter ╭─[sort.lis:5:13] 4 │ let nums = [3, 1, 2] 5 │ sort.Ints(nums) · ──┬─ · ╰── expected mutable, found immutable 6 │ } ╰──── help: Bindings in Lisette are immutable by default. Use let mut nums = ... to allow mutation