regression: binop(?) type inference failures #91872
Description
A bunch of errors around type inference failure detected in the crater run -- I would like us to track down the PR causing these since I'm not finding an obvious reason off hand:
- https://crater-reports.s3.amazonaws.com/beta-1.58-1/beta-2021-11-30/gh/mwc10.dt-backup/log.txt
- https://crater-reports.s3.amazonaws.com/beta-1.58-1/beta-2021-11-30/gh/DaTa-.advent-of-code-2020/log.txt
- https://crater-reports.s3.amazonaws.com/beta-1.58-1/beta-2021-11-30/gh/MikkelPaulson.advent-of-code-2019/log.txt
- https://crater-reports.s3.amazonaws.com/beta-1.58-1/beta-2021-11-30/gh/bfollek.advent2018rust/log.txt
- https://crater-reports.s3.amazonaws.com/beta-1.58-1/beta-2021-11-30/gh/daniellockyer.wrp/log.txt
- https://crater-reports.s3.amazonaws.com/beta-1.58-1/beta-2021-11-30/gh/proelbtn.chacha20poly1305/log.txt
- https://crater-reports.s3.amazonaws.com/beta-1.58-1/beta-2021-11-30/gh/qinxiaoguang.rs-lc/log.txt
- https://crater-reports.s3.amazonaws.com/beta-1.58-1/beta-2021-11-30/gh/ruudjelinssen.aoc2020/log.txt
- https://crater-reports.s3.amazonaws.com/beta-1.58-1/beta-2021-11-30/reg/roots-0.0.7/log.txt
- https://crater-reports.s3.amazonaws.com/beta-1.58-1/beta-2021-11-30/reg/segsource-0.2.0/log.txt
- https://crater-reports.s3.amazonaws.com/beta-1.58-1/beta-2021-11-30/gh/desbma.motd/log.txt
- https://crater-reports.s3.amazonaws.com/beta-1.58-1/beta-2021-11-30/gh/l0s.advent-of-code-rust/log.txt
- https://crater-reports.s3.amazonaws.com/beta-1.58-1/beta-2021-11-30/reg/dent-0.4.1/log.txt
- https://crater-reports.s3.amazonaws.com/beta-1.58-1/beta-2021-11-30/gh/GCYYfun.OSTEP_RUST/log.txt
- https://crater-reports.s3.amazonaws.com/beta-1.58-1/beta-2021-11-30/gh/botwob.AdventOfCode2019/log.txt
- https://crater-reports.s3.amazonaws.com/beta-1.58-1/beta-2021-11-30/reg/zero_pass_backend-0.0.7/log.txt
It seems plausible this is the breakage noted in #90904, but we should confirm.