minor: Add in-rust-tree feature to hir-expand

crates/hir-def/Cargo.toml

@@ -54,7 +54,7 @@ test-utils.workspace = true
 test-fixture.workspace = true
 
 [features]
-in-rust-tree = []
+in-rust-tree = ["hir-expand/in-rust-tree"]
 
 [lints]
 workspace = true

crates/hir-expand/Cargo.toml

@@ -37,5 +37,8 @@ parser.workspace = true
 [dev-dependencies]
 expect-test = "1.4.0"
 
+[features]
+in-rust-tree = ["syntax/in-rust-tree"]
+
 [lints]
 workspace = true

crates/hir-expand/src/lib.rs

@@ -3,7 +3,7 @@
 //! Specifically, it implements a concept of `MacroFile` -- a file whose syntax
 //! tree originates not from the text of some `FileId`, but from some macro
 //! expansion.
-
+#![cfg_attr(feature = "in-rust-tree", feature(rustc_private))]
 #![warn(rust_2018_idioms, unused_lifetimes)]
 
 pub mod attrs;

crates/hir-ty/Cargo.toml

@@ -61,7 +61,7 @@ test-utils.workspace = true
 test-fixture.workspace = true
 
 [features]
-in-rust-tree = []
+in-rust-tree = ["hir-expand/in-rust-tree"]
 
 [lints]
 workspace = true

crates/hir/Cargo.toml

@@ -33,7 +33,7 @@ tt.workspace = true
 span.workspace = true
 
 [features]
-in-rust-tree = []
+in-rust-tree = ["hir-expand/in-rust-tree"]
 
 [lints]
 workspace = true

crates/load-cargo/Cargo.toml

@@ -28,5 +28,8 @@ tt.workspace = true
 vfs-notify.workspace = true
 vfs.workspace = true
 
+[features]
+in-rust-tree = ["hir-expand/in-rust-tree"]
+
 [lints]
 workspace = true

crates/rust-analyzer/Cargo.toml

@@ -94,6 +94,7 @@ in-rust-tree = [
     "hir/in-rust-tree",
     "hir-def/in-rust-tree",
     "hir-ty/in-rust-tree",
+    "load-cargo/in-rust-tree",
 ]
 
 [lints]