Go — Hello World
The classic hello-world in Go — package main, an import, and fmt.Println, tab-indented like gofmt — for testing highlighters, the Go compiler, and parsers.
// The classic first program, in Go.
package main
import "fmt"
func main() {
fmt.Println("Hello, world!")
}
Specifications
- Language
- Go
- Kind
- hello-world
- Lines
- 8
- Encoding
- UTF-8
- Line Endings
- LF
Testing contract
Expected to pass- Scenario
- Run `gofmt -l` over the file, then build and run it.
- Expected result
- gofmt reports no changes - the file is already tab-indented in gofmt's exact output form - and the program prints exactly `Hello, world!`. This is the fixture for checking that a formatter is idempotent rather than merely non-crashing.
What is a .go file?
Go (.go) is a plain-text source file for the Go programming language — a statically typed, compiled language from Google designed for simplicity and concurrency. It features goroutines and channels, a fast compiler, garbage collection, structs with methods, and interfaces, with a strict standard formatting.
How to use this file
Use an example .go file to test syntax highlighters, the Go compiler and vet, gofmt, linters, and parser or language-detection tooling.
How to use this file for testing
“Go — 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: Go · 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.
Code examples
go run hello-world.goRelated files
- goGo — Worker pool (goroutines, channels)A realistic Go program: a worker pool with structs and methods, goroutines, buffered channels, and a sync.WaitGroup — tab-indented like gofmt, for testing highlighters, go vet, and parsers.
- goGo GenericsGo generics helper for gopls / highlighter fixtures.
- goGo Lint Invalid — Errcheck InvalidIntentionally lint-bait SAMPLE go snippet (errcheck-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_samples.py. Free for any use, no attribution required — license.