use find_ancestor_inside to get right span in CastCheck

src/test/ui/cast/cast-macro-lhs.rs

@@ -0,0 +1,12 @@
+// Test to make sure we suggest "consider casting" on the right span
+
+macro_rules! foo {
+    () => { 0 }
+}
+
+fn main() {
+    let x = foo!() as *const [u8];
+    //~^ ERROR cannot cast `usize` to a pointer that is wide
+    //~| NOTE creating a `*const [u8]` requires both an address and a length
+    //~| NOTE consider casting this expression to `*const ()`, then using `core::ptr::from_raw_parts`
+}

src/test/ui/cast/cast-macro-lhs.stderr

@@ -0,0 +1,11 @@
+error[E0606]: cannot cast `usize` to a pointer that is wide
+  --> $DIR/cast-macro-lhs.rs:8:23
+   |
+LL |     let x = foo!() as *const [u8];
+   |             ------    ^^^^^^^^^^^ creating a `*const [u8]` requires both an address and a length
+   |             |
+   |             consider casting this expression to `*const ()`, then using `core::ptr::from_raw_parts`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0606`.