Go: expected 'package', found 'EOF'

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Root Cause

In Go, every source file must begin with a `package` declaration (e.g., `package main` or `package utils`). This compilation error occurs when the Go compiler reads a file that is completely empty or contains only comments/whitespace before the end-of-file (EOF). It is extremely common when you create a new file in your IDE but try to run `go build` or `go run` before typing anything into the new file.

Fix / Solution

Open the offending file and add a `package` declaration at the very top. If the file is meant to be an executable program, use `package main`. If it's a library or utility file, use a descriptive package name that matches the directory it resides in. Never leave `.go` files entirely blank.

Code Snippet

// ❌ Empty file (main.go) causes 'expected package, found EOF'

// ✅ Correct file structure
package main

import "fmt"

func main() {
    fmt.Println("Hello, Go!")
}