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-rw-r--r--src/doc/rustc-dev-guide/src/diagnostics/diagnostic-items.md2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/doc/rustc-dev-guide/src/diagnostics/diagnostic-items.md b/src/doc/rustc-dev-guide/src/diagnostics/diagnostic-items.md
index 78fdd032d1a..9360427d660 100644
--- a/src/doc/rustc-dev-guide/src/diagnostics/diagnostic-items.md
+++ b/src/doc/rustc-dev-guide/src/diagnostics/diagnostic-items.md
@@ -104,7 +104,7 @@ use rustc_span::symbol::sym;
 /// `TyCtxt::is_diagnostic_item()`
 fn example_1(cx: &LateContext<'_>, ty: Ty<'_>) -> bool {
     match ty.kind() {
-        ty::Adt(adt, _) => cx.tcx.is_diagnostic_item(sym::HashMap, adt.did),
+        ty::Adt(adt, _) => cx.tcx.is_diagnostic_item(sym::HashMap, adt.did()),
         _ => false,
     }
 }