borrow_interior_mutable_const ICE into FN
#13877
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Convert the ICE reported in rust-lang#12979 into a false negative. We prefer a false negative to a ICE (because the ICE could still affect the user even when not activating the lint).
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This PR just makes sure that we exit the function before getting an ICE and adds a regression test. Related to #12979. We would need to keep researching the issue, but as the ICEing code isn't that complicated, getting a hotfix into nightly is urgent.
changelog:[
borrow_interior_mutable_const] Fix ICE #12979