rs84 B

Rust — Hello World

The classic hello-world in Rust — fn main and the println! macro — for testing highlighters, rustc, and parsers.

Syntax highlighting Code parsing Editor testing

Preview — first 5 linesrs

// The classic first program, in Rust.
fn main() {
    println!("Hello, world!");
}

Specifications

Language: Rust
Kind: hello-world
Lines: 4
Encoding: UTF-8
Line Endings: LF

Testing contract

Expected to pass

Scenario: Compile the file with rustc and run it.
Expected result: It compiles with no warnings and prints exactly `Hello, world!`. `println!` is a macro invocation, so a highlighter that colours `println` as a plain function call has not handled the `!`.

What is a .rs file?

Rust (.rs) is a plain-text source file for the Rust programming language — a statically typed, compiled systems language focused on memory safety without a garbage collector, enforced by its ownership and borrow checker. It features enums with data, pattern matching, traits, generics, and a strong type system.

How to use this file

Use an example .rs file to test syntax highlighters, the rustc compiler and cargo, rustfmt and clippy, and parser or language-detection tooling against real Rust constructs.

How to use this file for testing

“Rust — Hello World” is a deterministic Novus Examples fixture for Syntax highlighting, Code parsing, Editor testing. Idiomatic hello-world programs and realistic snippets across sixteen languages, exercising comments, string escapes, interpolation, numeric literals, and language keywords — for testing syntax highlighters, editor themes, and tree-sitter grammars.

Documented properties for this file: Rust · UTF-8 · LF. Compare results against paired or grouped companions on this page when present (clean↔damaged, searchable↔scanned, or format twins) so scores stay reproducible across runs.

Download the file once, keep the path stable in CI or local scripts, and treat the spec table as the contract: dimensions, seeds, field lists, and roles are intentional. Corrupt or invalid samples are labelled as such — expect parsers to fail loudly rather than silently accept them.

This is a short, known-correct source file. Run it through your syntax highlighter, linter, formatter, tree-sitter grammar, or parser, and open it in the in-browser editor to tweak and re-download. Each snippet exercises comments, string escapes, literals, and language keywords.