Here are a few title options, emphasizing the question structure: * **Why Do Loop Variables Cause Scopelint Errors in Function Literals?** * **How to Avoid Scopelint Errors When Using Loop Variables

Using Loop Variables in Function Literals: Scopelint Errors

When using loop variables within function literals, it can raise scopelint errors indicating that variables defined in the loop scope are being utilized in the function literal. This occurs because the compiler cannot guarantee that the function literal will not be called after the loop has completed, potentially leading to incorrect variable values.

Consider the following code snippet:

<code class="go">func TestGetUID(t *testing.T) {
    for _, x := range tests {
        t.Run(x.description, func(t *testing.T) {
            client := fake.NewSimpleClientset(x.objs...)
            actual := getUID(client, x.namespace)
            assert.Equal(t, x.expected, actual)
        })
    }
}</code>

Here, the loop variable x is used within the function literal passed to t.Run(). The error messages point out that this usage is problematic because the function literal might access outdated or modified values of x.

To resolve this issue, the loop variable must be copied or passed explicitly as an argument to the function literal. One solution is to create a copy of the loop variable using a variable declaration:

<code class="go">x2 := x</code>

Then, refer to x2 within the function literal instead of directly referencing x. Alternatively, the loop variable can be passed explicitly as an argument to the function literal, ensuring that it has a fixed value at the time the function is called.

For example:

<code class="go">t.Run(x.description, func(t *testing.T, x string) {
    client := fake.NewSimpleClientset(x.objs...)
    actual := getUID(client, x.namespace)
    assert.Equal(t, x.expected, actual)
}(x))</code>

By addressing these scopelint errors, we can avoid potential bugs and ensure correct variable usage within function literals.

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