1 files changed, 9 insertions, 3 deletions
diff --git a/compiler/rustc_middle/src/thir.rs b/compiler/rustc_middle/src/thir.rs
index 8bef9dfe0..5f320708c 100644
--- a/compiler/rustc_middle/src/thir.rs
+++ b/compiler/rustc_middle/src/thir.rs
@@ -9,6 +9,7 @@
 //! [rustc dev guide]: https://rustc-dev-guide.rust-lang.org/thir.html
 
 use rustc_ast::{InlineAsmOptions, InlineAsmTemplatePiece};
+use rustc_errors::{DiagnosticArgValue, IntoDiagnosticArg};
 use rustc_hir as hir;
 use rustc_hir::def_id::DefId;
 use rustc_hir::RangeEnd;
@@ -35,9 +36,8 @@ macro_rules! thir_with_elements {
         $(
             newtype_index! {
                 #[derive(HashStable)]
-                pub struct $id {
-                    DEBUG_FORMAT = $format
-                }
+                #[debug_format = $format]
+                pub struct $id {}
             }
         )*
 
@@ -576,6 +576,12 @@ impl<'tcx> Pat<'tcx> {
     }
 }
 
+impl<'tcx> IntoDiagnosticArg for Pat<'tcx> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+        format!("{}", self).into_diagnostic_arg()
+    }
+}
+
 #[derive(Clone, Debug, HashStable)]
 pub struct Ascription<'tcx> {
     pub annotation: CanonicalUserTypeAnnotation<'tcx>,