Rust Result Map
Rust Result map chain — realistic error-handling snippet.
fn parse_u32(s: &str) -> Result<u32, std::num::ParseIntError> {
s.parse()
}
fn main() {
let n = parse_u32("42").map(|x| x + 1).unwrap();
println!("{n}");
}
Specifications
- Language
- rust
- Role
- idiomatic sample
- Line Endings
- LF
- Wave
- G
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 Result Map” 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: idiomatic sample · rust · 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.
Code examples
rustc result_map.rs -o prog && ./progRelated files
- rsRust — Hello WorldThe classic hello-world in Rust — fn main and the println! macro — for testing highlighters, rustc, and parsers.
- rsRust — Shapes (enum, trait, pattern matching)A realistic Rust snippet with an enum carrying data, a trait and impl, exhaustive match, iterators, and Option handling — for testing highlighters, rustc, clippy, and parsers against real ownership-era code.
- rsRust Lint Invalid — Unwrap InvalidIntentionally lint-bait SAMPLE rust snippet (unwrap-invalid) for rule-engine tests.
- cC — Hello WorldThe classic hello-world in C — an include, main, and printf — for testing highlighters, C compilers, and parsers against the canonical first program.
- cC — Linked list (structs, malloc, pointers)A realistic C program: a singly linked list with a typedef struct, malloc/free memory management, pointer walking, and error handling — for testing highlighters, compilers, and static analysers.
- cC StructC struct SAMPLE for clangd / highlighter fixtures.
Generated by generation/code_wave_g.py. Free for any use, no attribution required — license.