2229: Discr should be read when PatKind is Range

compiler/rustc_typeck/src/expr_use_visitor.rs

@@ -267,12 +267,15 @@ impl<'a, 'tcx> ExprUseVisitor<'a, 'tcx> {
                                     }
                                 }
                             }
-                            PatKind::Lit(_) => {
-                                // If the PatKind is a Lit then we want
+                            PatKind::Lit(_) | PatKind::Range(..) => {
+                                // If the PatKind is a Lit or a Range then we want
                                 // to borrow discr.
                                 needs_to_be_read = true;
                             }
-                            _ => {}
+                            _ => {
+                                // If the PatKind is Or, Box, Slice or Ref, the decision is made later
+                                // as these patterns contains subpatterns
+                            }
                         }
                     }));
                 }

src/test/ui/closures/2229_closure_analysis/issue-87426.rs

@@ -0,0 +1,14 @@
+// run-pass
+// edition:2021
+
+pub fn foo() {
+    let ref_x_ck = 123;
+    let _y = || match ref_x_ck {
+        2_000_000..=3_999_999 => { println!("A")}
+        _ => { println!("B")}
+    };
+}
+
+fn main() {
+    foo();
+}