tests: ensure that #[disable_initialized_field_access] does not emit accessors

Signed-off-by: Benno Lossin <lossin@kernel.org>

Author: BennoLossin

tests/ui/compile-fail/init/no_field_access.rs

@@ -0,0 +1,19 @@
+use pin_init::*;
+
+#[repr(C, packed)]
+struct Foo {
+    a: i8,
+    b: i32,
+    c: i32,
+}
+
+fn main() {
+    let _ = init!(
+        #[disable_initialized_field_access]
+        Foo {
+            c: -42,
+            b: *c,
+            a: 0,
+        }
+    );
+}

tests/ui/compile-fail/init/no_field_access.stderr

@@ -0,0 +1,5 @@
+error[E0425]: cannot find value `c` in this scope
+  --> tests/ui/compile-fail/init/no_field_access.rs:15:17
+   |
+15 |             b: *c,
+   |                 ^ not found in this scope