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Diffstat (limited to 'crates/mbe/src/lib.rs')
-rw-r--r--crates/mbe/src/lib.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/crates/mbe/src/lib.rs b/crates/mbe/src/lib.rs
index dd71e46db3..ca10a2be27 100644
--- a/crates/mbe/src/lib.rs
+++ b/crates/mbe/src/lib.rs
@@ -6,6 +6,8 @@
//! The tests for this functionality live in another crate:
//! `hir_def::macro_expansion_tests::mbe`.
+#![cfg_attr(feature = "in-rust-tree", feature(rustc_private))]
+
#[cfg(not(feature = "in-rust-tree"))]
extern crate ra_ap_rustc_lexer as rustc_lexer;
#[cfg(feature = "in-rust-tree")]