§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.