Fix for-loop expressions breaking with BlockExpr iterable

crates/hir_ty/src/tests/regression.rs

@@ -1221,3 +1221,27 @@ fn mamba(a: U32!(), p: u32) -> u32 {
     "#,
     )
 }
+
+#[test]
+fn for_loop_block_expr_iterable() {
+    check_infer(
+        r#"
+fn test() {
+    for _ in { let x = 0; } {
+        let y = 0;
+    }
+}
+        "#,
+        expect![[r#"
+            10..68 '{     ...   } }': ()
+            16..66 'for _ ...     }': ()
+            20..21 '_': {unknown}
+            25..39 '{ let x = 0; }': ()
+            31..32 'x': i32
+            35..36 '0': i32
+            40..66 '{     ...     }': ()
+            54..55 'y': i32
+            58..59 '0': i32
+        "#]],
+    );
+}