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const effect = () => console.log( 'effect' );
var { x: a2 = effect() } = {};
var { x: a3 = () => {} } = { x: effect };
a3();
var { x: a4 = effect } = {};
a4();
var b2;
({ x: b2 = effect() } = {});
var b3;
({ x: b3 = () => {} } = { x: effect });
b3();
var b4;
({ x: b4 = effect } = {});
b4();
var [ c2 = effect() ] = [];
var [ c3 = () => {} ] = [ effect ];
c3();
var [ c4 = effect ] = [];
c4();
var d2;
[ d2 = effect() ] = [];
var d3;
[ d3 = () => {} ] = [ effect ];
d3();
var d4;
[ d4 = effect ] = [];
d4();
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