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Issue Description:

As per this Swift Forums topic, the following code should trap due to overlapping read/write access.

var stepSize = 1

func increment(_ number: inout Int) {
    number += stepSize
}

increment(&stepSize)

As specified on the docs,

> The read and write accesses refer to the same memory and they overlap, producing a conflict.

However, I put the code in a playground like such:


And nothing happens