kotlin-fork/compiler/testData/diagnostics/tests/backingField/FieldAsParam.kt

// DIAGNOSTICS: +UNUSED_PARAMETER
var y: Int = 1

// No backing field!
<!MUST_BE_INITIALIZED!>var x: Int<!>
    get() = y
    set(<!ACCESSOR_PARAMETER_NAME_SHADOWING, UNUSED_PARAMETER!>field<!>) {
        y = field
    }