Basic hello world

open std::io;

// const { io } = import!("std");
pub main := fn() -> () {
  io.println("Hello, world");
  io.Writer
  iterator.map(color::Color::to_bytes)
};

Structured data

Color ::= Color { red: u8, green: u8, blue: u8 };

Union types

Result<T, E> ::= Ok (T) | Err (E);

Option<T> ::= Some (T) | None;

MaybeColor ::= SomeColor { red: u8, green: u8, blue: u8 } | None;

Symbol Semantics

• = => Equal by assignment (or reassignment)
• := => Equal by definition
• ::= => Equal in structure or type
• // => in-line comment
• /// => in-line doc comment
• //! => in-line module doc comment
• | => type union

Classes

Same thing as a Haskell typeclass or Rust trait.