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-rw-r--r--compiler/rustc_middle/src/ty/print/mod.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/rustc_middle/src/ty/print/mod.rs b/compiler/rustc_middle/src/ty/print/mod.rs
index d9aa7f9e5c4..9d0e1123e43 100644
--- a/compiler/rustc_middle/src/ty/print/mod.rs
+++ b/compiler/rustc_middle/src/ty/print/mod.rs
@@ -259,7 +259,7 @@ fn characteristic_def_id_of_type_cached<'a>(
 
         ty::Dynamic(data, ..) => data.principal_def_id(),
 
-        ty::Array(subty, _) | ty::Slice(subty) => {
+        ty::Pat(subty, _) | ty::Array(subty, _) | ty::Slice(subty) => {
             characteristic_def_id_of_type_cached(subty, visited)
         }