Destructuring assignment prevents tree shaking of function with prototypes

• Rollup Version: 2.33.3
• Operating System (or Browser): Firefox
• Node Version (if applicable): N/A
• Link to reproduction (IMPORTANT, read below): https://rollupjs.org/repl/?version=2.33.3&shareable=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

In this configuration:

function Foo () {}

Foo.prototype.bar = function () {}

const obj = { Foo$: Foo }

const { Foo$ } = obj

I can't figure out why "Foo" is not removed after tree-shaking. Using const Foo$ = obj.Foo$ or removing Foo.prototype.bar declaration fixes the issue.

Expected Behavior

In the example above, everything should be removed after tree-shaking

Actual Behavior

The function Foo and Foo.prototype.bar declarations are kept after thee-shaking

Start with the linked Rollup REPL reproduction using the shown destructuring assignment and prototype property. Compare its output with the direct property assignment case, then trace the tree-shaking behavior; done means the unused Foo function and Foo.prototype.bar declarations are removed as expected.