If the borrow checker of 1.52.1 "screeches" on every LOC but it compiles on 1.0 then very likely either there's some bug in 1.52.1 that you should report or you code was never correct and should never have compiled in 1.0 in the first place but did due to a compiler bug that since got fixed.
Of course, without more info nobody can tell which of these or even whether it is one of these two or something else.
Of course, without more info nobody can tell which of these or even whether it is one of these two or something else.