https://doc.rust-lang.org/stable/nightly-rustc/rustc_hir/def_id/type.DefIdSet.html
DefIdSet in rustc_hir::def_id - Rust
API documentation for the Rust `DefIdSet` type in crate `rustc_hir`.
rustchirdefid
https://doc.rust-lang.org/beta/nightly-rustc/rustc_span/def_id/type.DefIdSet.html
DefIdSet in rustc_span::def_id - Rust
API documentation for the Rust `DefIdSet` type in crate `rustc_span`.
rustcspandefid