*
     * Relies on the fact that in such references only the last qualifier refers to the
     * actual extension callable, and the part before that refers to the receiver type (either fully
     * or partially qualified).
     *
     * For example, `foo.Foo.bar` may only refer to the extension callable `bar` with

        val referencedSymbolsByFir = listOfNotNull(symbolBuilder.buildSymbol(referencedSymbol))
        val fullQualifiedAccess = when (val psi = fir.source.psi) {
            // for cases like `Foo.Bar()`, where `Foo.Bar` is an object, and `Foo.Bar()` is a call to `invoke` operator
            is KtSimpleNameExpression -> psi.getQualifiedElement()
            else -> psi
        }

        if (!PsiTreeUtil.isAncestor(defaultStatementFromFir, defaultStatement, false)) {
            // In certain cases, expressions might be different in PSI and FIR sources.
            // E.g., in 'foo.<expr>bar()</expr>', there is no FIR expression that corresponds to the 'bar()' KtCallExpression.
            return null
        }

        return firDefaultStatement.resolvedType
    }

/**
 * Returns `true` if [this] expression is fully-qualified with package name.
 * Such expressions definitely do not need any kind of imports.
 *
 * Examples:
 * - `pkg.foo()` - `true`
 * - `foo()` - `false`
 * - `Obj.foo()` - `false`
 * - `pkg.Obj.foo()` - `false`
 */
private val FirQualifiedAccessExpression.isQualifiedWithPackage: Boolean
    get() {
        val receiver = explicitReceiver

 *
 * Named functions do not consider their bodies used if
 *  - the function body is a block e.g., `fun foo(): Int { return bar }` or
 *  - the function itself returns Unit
 */
private fun doesNamedFunctionUseBody(namedFunction: KtNamedFunction, body: PsiElement): Boolean = when {
    // The body is a block expression e.g., fun foo(): Int { return bar }
    namedFunction.bodyBlockExpression == body ->
        false

        val expectedKind = expectedType.toConstantValueKind()
        // Note that the resolved type for the const expression is not always matched with the const kind. For example,
        //   fun foo(x: Int) {
        //     when (x) {
        //       -2_147_483_628 -> ...
        //   } }
        // That constant is encoded as `unaryMinus` call with the const 2147483628 of long type, while the resolved type is Int.