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-rw-r--r--compiler/rustc_ast/src/expand/mod.rs3
1 files changed, 3 insertions, 0 deletions
diff --git a/compiler/rustc_ast/src/expand/mod.rs b/compiler/rustc_ast/src/expand/mod.rs
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index 000000000..2ee1bfe0a
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+++ b/compiler/rustc_ast/src/expand/mod.rs
@@ -0,0 +1,3 @@
+//! Definitions shared by macros / syntax extensions and e.g. `rustc_middle`.
+
+pub mod allocator;