swc/crates/swc_ecma_parser/tests/tsc/privateNameInLhsReceiverExpression.ts

// @target: es2015

class Test {
    #y = 123;
    static something(obj: { [key: string]: Test }) {
        obj[(new class { #x = 1; readonly s = "prop"; }).s].#y = 1;
        obj[(new class { #x = 1; readonly s = "prop"; }).s].#y += 1;
    }
}