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-rw-r--r--compiler/rustc_query_system/src/query/mod.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/compiler/rustc_query_system/src/query/mod.rs b/compiler/rustc_query_system/src/query/mod.rs
index a87f598674e..855769dacc3 100644
--- a/compiler/rustc_query_system/src/query/mod.rs
+++ b/compiler/rustc_query_system/src/query/mod.rs
@@ -152,6 +152,8 @@ pub enum QuerySideEffect {
 pub trait QueryContext: HasDepContext {
     type QueryInfo: Clone;
 
+    /// Gets a jobserver reference which is used to release then acquire
+    /// a token while waiting on a query.
     fn jobserver_proxy(&self) -> &Proxy;
 
     fn next_job_id(self) -> QueryJobId;