Cannot Use Blank Identifier as Value

Why This Happens

The blank identifier _ is used to discard values you do not need. It is not a variable and has no value. You cannot reference it in expressions, pass it as an argument, or use it anywhere a value is expected.

The Problem

func main() {
    _ = 42
    fmt.Println(_) // cannot use _ as value
}

The Fix

func main() {
    x := 42
    fmt.Println(x)
}

Step-by-Step Fix

1. 1

   Identify the blank identifier read

   Find where _ is being used as a value rather than as an assignment target.

2. 2

   Assign to a real variable

   Replace _ with a named variable if you need to use the value.

3. 3

   Remove if unnecessary

   If the value is truly not needed, remove the reference entirely.