fixed mistake with in "testing stacked borrows" There was code and resultin error message mismatch: code was `let sref3 = &*mref1;` and error is `casting `&&mut i32` as `*mut i32` is invalid`. Then the phrase goes: Let's properly reborrow it with let sref3 = &mref1 But it should be the opposite: `let sref3 = &mref1;` gives `&&mut i32`
fixed mistake with in "testing stacked borrows"
There was code and resultin error message mismatch:
code was `let sref3 = &*mref1;`
and error is `casting `&&mut i32` as `*mut i32` is invalid`.
Then the phrase goes: Let's properly reborrow it with let sref3 = &mref1
But it should be the opposite:
`let sref3 = &mref1;` gives `&&mut i32`

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