d3ff9ac8e8
prevent potential bug in `encode_with_shorthand`. see https://rust-lang.zulipchat.com/#narrow/stream/233931-t-compiler.2Fmajor-changes/topic/Remove.20PredicateKind.20in.20favor.20of.20only.20Bin.E2.80.A6.20compiler-team.23397/near/223012169
For more information about how rustc works, see the rustc dev guide.