Hello, world

The smallest Lux program — one function, one print.

# The smallest Lux program.
fn main():
    print("Hello, world!")

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Walkthrough

fn main(): declares the entry point — a colon opens an indented block, like Python.
print writes to standard output. The standard library ships with the runtime; there is nothing to import for common work.
No semicolons, no braces, no boilerplate: this is the complete program.