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const removed1 = { x: () => {} };
removed1.x();
const removed2 = { x: { y: () => {} } };
removed2.x.y();
const retained1 = { x: () => {} };
retained1.y();
const retained2 = { x: () => {} };
retained2.x = {};
retained2.x();
const retained3 = { x: { y: () => console.log('effect') } };
const retained4 = { x: { y: {} } };
retained4.x = retained3.x;
retained4.x.y();
const retained5 = { x: () => {} };
const retained6 = retained5;
retained6.x = () => console.log('effect');
retained5.x();
const retained7 = { x: { y: () => {} } };
const retained8 = { x: retained7.x };
retained8.x.y = () => console.log( 'effect' );
retained7.x.y();
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