rustc_hir_id: Add a comment explaining why the crate exists

joshtriplett · joshtriplett · commit 2ea7e7da0074 · 2025-08-20T15:04:00.000-07:00
diff --git a/compiler/rustc_hir_id/src/lib.rs b/compiler/rustc_hir_id/src/lib.rs
@@ -1,3 +1,5 @@
+//! Library containing Id types from `rustc_hir`, split out so crates can use it without depending
+//! on all of `rustc_hir` (which is large and depends on other large things like `rustc_target`).
 #![allow(internal_features)]
 #![feature(negative_impls)]
 #![feature(rustc_attrs)]

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,5 @@`
	`1`	+//! Library containing Id types from `rustc_hir`, split out so crates can use it without depending
	`2`	+//! on all of `rustc_hir` (which is large and depends on other large things like `rustc_target`).
`1`	`3`	`#![allow(internal_features)]`
`2`	`4`	`#![feature(negative_impls)]`
`3`	`5`	`#![feature(rustc_attrs)]`