[regression] println borrow check errors

[Mark-Simulacrum]

• https://crater-reports.s3.amazonaws.com/beta-1.61-2/beta-2022-04-18/gh/Acrylic125.rust-tutorial/log.txt
• https://crater-reports.s3.amazonaws.com/beta-1.61-2/beta-2022-04-18/gh/DreamLarva.learn-rust/log.txt
• https://crater-reports.s3.amazonaws.com/beta-1.61-2/beta-2022-04-18/gh/Francososa.threads/log.txt
• https://crater-reports.s3.amazonaws.com/beta-1.61-2/beta-2022-04-18/gh/Jaco26.rust_chess/log.txt
• https://crater-reports.s3.amazonaws.com/beta-1.61-2/beta-2022-04-18/gh/fangerm.adventofcode2020/log.txt
• https://crater-reports.s3.amazonaws.com/beta-1.61-2/beta-2022-04-18/reg/yaap-0.0.2/log.txt

#94868 is likely cause (cc @dtolnay)

[dtolnay]

I'll fix this.