lower_constness

Author: TaKO8Ki

compiler/rustc_ast_lowering/src/expr.rs

@@ -1395,9 +1395,10 @@ impl<'hir, R: ResolverAstLoweringExt<'hir>> LoweringContext<'_, 'hir, R> {
             // knows that a `FnDecl` output type like `-> &str` actually means
             // "coroutine that returns &str", rather than directly returning a `&str`.
             kind: hir::ClosureKind::CoroutineClosure(coroutine_desugaring),
-            constness: hir::Constness::NotConst,
+            constness: self.lower_constness(constness),
             explicit_captures: &[],
         });
+
         hir::ExprKind::Closure(c)
     }