Why does Go give me \'err declared and not used\' error?

Variable Usage in Go

In Go, declaring a variable implies its intended use, and failure to utilize it results in a compile-time error. This practice stems from the language's emphasis on code clarity and the avoidance of unnecessary elements.

The provided code snippet triggers the error "err declared and not used" because the variable "err" is declared but never explicitly used in the code. While there is no scope or shadowing issue at play, the compiler requires that declared variables are appropriately utilized to prevent potential bugs or unused imports that can slow down compilation.

To resolve the error, the variable "err" can be assigned to an unused blank identifier, such as:

var _ = err

Alternatively, "err" can be used to perform error checking, such as:

if err != nil {
    fmt.Println(err.Error())
    return
}

Note that unused global variables and unused function parameters are acceptable in Go. However, it is always recommended to use variables that you declare to keep your code concise and readable.

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