§1 Lexical Structure

Identifiers begin with a letter or _ and may contain ASCII letters, digits, or _. Identifiers are case-sensitive. Reserved keywords may not be used as identifiers.

Keywords — see Keywords Reference for the full list with descriptions.

Literals:

Kind	Examples	Notes
Integer	`42`, `0`, `1_000_000`	Underscores allowed as separators
Float	`3.14`, `0.5`, `1.0e6`	64-bit IEEE 754
String	`"hello"`, `"line\n"`	UTF-8, escape sequences, `{{ }}` interpolation
Boolean	`true`, `false`
Null	`null`	Explicit absence of a value

Currency literals ($0.05) are not yet parsed — use 0.05 // USD as a comment annotation. Time literals (1s, 150ms) are not yet parsed — use numeric milliseconds.

Comments:

// single-line
/* ... */ multi-line
/// doc comments (on declarations)

Effect annotations — ![effect, ...] after a function/test/pipeline signature:

fn fetch(url: string) -> string ![io, net] { ... }

Canonical effects: io, net, model, gpu, rand, clock, plus unsafe, read, mut.