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-rw-r--r--src/librustc/driver/session.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/librustc/driver/session.rs b/src/librustc/driver/session.rs
index a412742ab3a..5d3069bbf3e 100644
--- a/src/librustc/driver/session.rs
+++ b/src/librustc/driver/session.rs
@@ -181,7 +181,7 @@ pub struct Session {
     // For a library crate, this is always none
     pub entry_fn: RefCell<Option<(NodeId, codemap::Span)>>,
     pub entry_type: Cell<Option<EntryFnType>>,
-    pub macro_registrar_fn: RefCell<Option<ast::DefId>>,
+    pub macro_registrar_fn: Cell<Option<ast::NodeId>>,
     pub default_sysroot: Option<Path>,
     pub building_library: Cell<bool>,
     // The name of the root source file of the crate, in the local file system. The path is always