init: allow nonstandard_style for generated accessor/value

CHANGELOG.md

@@ -38,6 +38,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Corrected `T: Sized` bounds to `T: ?Sized` in the generated `PinnedDrop`
   check by `#[pin_data]`.
+- `init!` no longer produces `nonstandard_style` group warnings at the call site, when
+  used for structs with non-snake-case field names. Warnings are still reported on the
+  struct definition, as expected.
 
 ## [0.0.10] - 2025-08-19
 

internal/src/init.rs

@@ -245,7 +245,12 @@ fn init_fields(
                     // Setting the span of `value_ident` to `value`'s span improves error messages
                     // when the type of `value` is wrong.
                     value_ident.set_span(value.span());
-                    quote!(let #value_ident = #value;)
+                    quote! {
+                        // Allow `nonstandard_style` since the same warning is going to be reported for
+                        // the struct field.
+                        #[allow(nonstandard_style)]
+                        let #value_ident = #value;
+                    }
                 });
                 // Again span for better diagnostics
                 let write = quote_spanned!(ident.span()=> ::core::ptr::write);
@@ -273,7 +278,9 @@ fn init_fields(
                         unsafe { #write(&raw mut (*#slot).#ident, #value_ident) };
                     }
                     #(#cfgs)*
-                    #[allow(unused_variables)]
+                    // Allow `nonstandard_style` since the same warning is going to be reported for
+                    // the struct field.
+                    #[allow(unused_variables, nonstandard_style)]
                     let #ident = #accessor;
                 }
             }
@@ -325,7 +332,9 @@ fn init_fields(
                         #value_init
                     }
                     #(#cfgs)*
-                    #[allow(unused_variables)]
+                    // Allow `nonstandard_style` since the same warning is going to be reported for
+                    // the struct field.
+                    #[allow(unused_variables, nonstandard_style)]
                     let #ident = #accessor;
                 }
             }

tests/nonstandard_style.rs

@@ -0,0 +1,31 @@
+//! Tests that no extra warnings are emitted for non-standard style fields when using `init!`.
+//!
+//! See: https://github.com/Rust-for-Linux/pin-init/issues/125
+
+// Should be implied by crate lint settings, but just to be sure:
+#![deny(nonstandard_style)]
+#![allow(dead_code)]
+#![cfg_attr(USE_RUSTC_FEATURES, feature(lint_reasons))]
+#![cfg_attr(USE_RUSTC_FEATURES, feature(raw_ref_op))]
+
+use pin_init::*;
+
+#[allow(nonstandard_style)]
+struct Foo {
+    NON_STANDARD_A: usize,
+    nonStandardB: Bar,
+}
+
+#[allow(non_snake_case)]
+struct Bar {
+    Non_Standard_C: usize,
+}
+
+impl Foo {
+    fn new() -> impl Init<Self> {
+        init!(Self {
+            NON_STANDARD_A: 42,
+            nonStandardB <- init!(Bar { Non_Standard_C: 42 }),
+        })
+    }
+}