1 files changed, 9 insertions, 1 deletions
diff --git a/compiler/rustc_middle/src/query/on_disk_cache.rs b/compiler/rustc_middle/src/query/on_disk_cache.rs
index 8b77a4a81ca..3849cb72668 100644
--- a/compiler/rustc_middle/src/query/on_disk_cache.rs
+++ b/compiler/rustc_middle/src/query/on_disk_cache.rs
@@ -12,6 +12,7 @@ use rustc_index::{Idx, IndexVec};
 use rustc_macros::{Decodable, Encodable};
 use rustc_middle::dep_graph::{DepNodeIndex, SerializedDepNodeIndex};
 use rustc_middle::mir::interpret::{AllocDecodingSession, AllocDecodingState};
+use rustc_middle::mir::mono::MonoItem;
 use rustc_middle::mir::{self, interpret};
 use rustc_middle::ty::codec::{RefDecodable, TyDecoder, TyEncoder};
 use rustc_middle::ty::{self, Ty, TyCtxt};
@@ -22,7 +23,7 @@ use rustc_session::Session;
 use rustc_span::hygiene::{
     ExpnId, HygieneDecodeContext, HygieneEncodeContext, SyntaxContext, SyntaxContextData,
 };
-use rustc_span::source_map::SourceMap;
+use rustc_span::source_map::{SourceMap, Spanned};
 use rustc_span::{
     BytePos, CachingSourceMapView, ExpnData, ExpnHash, Pos, RelativeBytePos, SourceFile, Span,
     SpanDecoder, SpanEncoder, StableSourceFileId, Symbol,
@@ -773,6 +774,13 @@ impl<'a, 'tcx> Decodable<CacheDecoder<'a, 'tcx>> for &'tcx [rustc_ast::InlineAsm
     }
 }
 
+impl<'a, 'tcx> Decodable<CacheDecoder<'a, 'tcx>> for &'tcx [Spanned<MonoItem<'tcx>>] {
+    #[inline]
+    fn decode(d: &mut CacheDecoder<'a, 'tcx>) -> Self {
+        RefDecodable::decode(d)
+    }
+}
+
 impl<'a, 'tcx> Decodable<CacheDecoder<'a, 'tcx>>
     for &'tcx crate::traits::specialization_graph::Graph
 {