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-rw-r--r--src/librustc/util/common.rs3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/librustc/util/common.rs b/src/librustc/util/common.rs
index dd635e5c946..5622fe43436 100644
--- a/src/librustc/util/common.rs
+++ b/src/librustc/util/common.rs
@@ -12,6 +12,7 @@ use std::time::{Duration, Instant};
 
 use std::sync::mpsc::{Sender};
 use syntax_pos::{SpanData};
+use rustc_macros::HashStable;
 use crate::ty::TyCtxt;
 use crate::dep_graph::{DepNode};
 use lazy_static;
@@ -22,7 +23,7 @@ pub const FN_OUTPUT_NAME: &str = "Output";
 
 // Useful type to use with `Result<>` indicate that an error has already
 // been reported to the user, so no need to continue checking.
-#[derive(Clone, Copy, Debug, RustcEncodable, RustcDecodable)]
+#[derive(Clone, Copy, Debug, RustcEncodable, RustcDecodable, HashStable)]
 pub struct ErrorReported;
 
 thread_local!(static TIME_DEPTH: Cell<usize> = Cell::new(0));