test: expand nonstandard_style lint test

Expands the test to also cover usage of `pin_init!` (instead of only
`init!`) on structs with non-standard style field names.

Suggested-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Mirko Adzic <adzicmirko97@gmail.com>

Author: Mirko-A

tests/nonstandard_style.rs

@@ -1,4 +1,5 @@
-//! Tests that no extra warnings are emitted for non-standard style fields when using `init!`.
+//! Tests that no extra warnings are emitted for non-standard style fields when using `init!`
+//! or `pin_init!`.
 //!
 //! See: https://github.com/Rust-for-Linux/pin-init/issues/125
 
@@ -16,6 +17,7 @@ struct Foo {
     nonStandardB: Bar,
 }
 
+// Make sure `allow(non_snake_case)` also works.
 #[allow(non_snake_case)]
 struct Bar {
     Non_Standard_C: usize,
@@ -29,3 +31,20 @@ impl Foo {
         })
     }
 }
+
+#[allow(nonstandard_style)]
+#[pin_data]
+struct Baz {
+    NON_STANDARD: usize,
+    #[pin]
+    nonStandardPin: usize,
+}
+
+impl Baz {
+    fn new(a: impl PinInit<usize>) -> impl PinInit<Self> {
+        pin_init!(Self {
+            NON_STANDARD: 42,
+            nonStandardPin <- a,
+        })
+    }
+}