Keywords

Source of truth: KEYWORDS in the compiler lexer (interpreter.py). This table is the implemented set.

Implemented keywords

Kind	Keywords
Declarations	fn, function, struct, class, enum, interface, type, let, var, pub, import, as, dyn, open, extends, override, new, static, async
Control	if, else, while, for, in, match, switch, case, return, break, continue, try, catch, await
Memory	region
Capabilities	needs, with
Contracts	requires, ensures, result
Logic	and, or, not, true, false
Effects / DX	print, eprint
Tests	test, assert

Notes:

• function is accepted; vow fmt normalizes it to fn.
• class ≡ struct for data layout; inheritance adds open / extends / override.
• new Type(…) calls Type.new when defined.
• switch / case desugar to match (same exhaustiveness).
• try / catch handle Result locally (not OS exceptions).
• async fn + await — cooperative async runtime with real yield points (db_query, read_file_async, spawn_blocking, async_sleep). Sync code calls async fns via block_on. See Async / await.
• dyn marks dynamic interface values (Array<dyn Shape>).
• region opens a sub-arena scope.
• result is meaningful inside ensures.
• Match wildcard _ is a pattern token, not listed in KEYWORDS.
• Full walkthrough: Tutorial / Syntax ergonomics

Prefer keywords over C punctuation

Avoid	Prefer
&& / || / !	and / or / not

Design-reserved (future)

Still not language features: comptime, unsafe. Avoid as identifiers.

Prelude / type names (not keywords)

int, int64, f32, f64, bool, String, Array, Map, Option, Result, Some, None, Ok, Err, Caps, FsRead, FsWrite, Net, Env, Clock, Rand, Proc, Threads, Thread, Process

Aliases: FileRead → FsRead, FileWrite → FsWrite, i32 → int, i64 → int64, string → String.

Next

• Tutorial
• Operators
• Syntax

Note

Prefer repository tests/lang/ when unsure — they are the STATUS regression suite.