p. 130 Lists/MutListIsList.kt: Uncomment "// list += 3 // Error" line did not cause an error about atomickotlinexamples HOT 4 CLOSED

You had to have changed val list = getList() to var list = getList() in order to produce that result.

However, I see the problem. list += 3 is creating a new List and re-assigning that to list. It is confusing, because += is doing some tricky things. add() is probably a better way to demonstrate this.

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I did indeed have "var list = getList()" in my file.

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I think what I need to do is simplify this example so it uses add() instead of +=.

And then I need to add a section on how += works when using containers.

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I just updated the Leapub ebook with the new version of the Lists chapter, with rewrites and a new section describing the behavior of +=.

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