Add regression test for issue-66768 #75177
                
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Fixes #66768
This is fixed by #70452 (in particular, https://github.com/rust-lang/rust/pull/70452/files#diff-53aef089a36a8e2ed07627fc8915fe63R1763) and I'm not sure it's worth to add this test (i.e. the tests in #70452 are enough), so r? @eddyb to confirm it.