Allow clippy::derive_partial_eq_without_eq on structs and builders

Author: jjant

codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/rustlang/RustType.kt

@@ -387,6 +387,7 @@ sealed class Attribute {
         val AllowDeadCode = Custom("allow(dead_code)")
         val DocHidden = Custom("doc(hidden)")
         val DocInline = Custom("doc(inline)")
+        val DerivePartialEqWithoutEq = Custom("allow(clippy::derive_partial_eq_without_eq)")
     }
 
     data class Derives(val derives: Set<RuntimeType>) : Attribute() {

codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/generators/BuilderGenerator.kt

@@ -9,6 +9,7 @@ import software.amazon.smithy.codegen.core.Symbol
 import software.amazon.smithy.model.Model
 import software.amazon.smithy.model.shapes.MemberShape
 import software.amazon.smithy.model.shapes.StructureShape
+import software.amazon.smithy.rust.codegen.core.rustlang.Attribute
 import software.amazon.smithy.rust.codegen.core.rustlang.RustReservedWords
 import software.amazon.smithy.rust.codegen.core.rustlang.RustType
 import software.amazon.smithy.rust.codegen.core.rustlang.RustWriter
@@ -159,10 +160,12 @@ class BuilderGenerator(
 
         writer.docs("A builder for #D.", structureSymbol)
         // Matching derives to the main structure + `Default` since we are a builder and everything is optional.
-        val baseDerives = structureSymbol.expectRustMetadata().derives
-        val derives = baseDerives.derives.intersect(setOf(RuntimeType.Debug, RuntimeType.PartialEq, RuntimeType.Clone)) + RuntimeType.Default
-        baseDerives.copy(derives = derives).render(writer)
-        writer.rustBlock("pub struct $builderName") {
+        val containerMeta = structureSymbol.expectRustMetadata()
+        val derives = containerMeta.derives.copy(derives = containerMeta.derives.derives.intersect(setOf(RuntimeType.Debug, RuntimeType.PartialEq, RuntimeType.Clone)) + RuntimeType.Default)
+        val additionalAttributes = containerMeta.additionalAttributes.toMutableList();
+        additionalAttributes.add(Attribute.DerivePartialEqWithoutEq)
+        containerMeta.copy(derives = derives, additionalAttributes = additionalAttributes).render(writer)
+        writer.rustBlock("struct $builderName") {
             for (member in members) {
                 val memberName = symbolProvider.toMemberName(member)
                 // All fields in the builder are optional.

codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/generators/StructureGenerator.kt

@@ -24,6 +24,7 @@ import software.amazon.smithy.rust.codegen.core.rustlang.isDeref
 import software.amazon.smithy.rust.codegen.core.rustlang.render
 import software.amazon.smithy.rust.codegen.core.rustlang.rust
 import software.amazon.smithy.rust.codegen.core.rustlang.rustBlock
+import software.amazon.smithy.rust.codegen.core.rustlang.Attribute
 import software.amazon.smithy.rust.codegen.core.smithy.CodegenTarget
 import software.amazon.smithy.rust.codegen.core.smithy.RuntimeType
 import software.amazon.smithy.rust.codegen.core.smithy.RustSymbolProvider
@@ -160,10 +161,14 @@ open class StructureGenerator(
         writer.documentShape(shape, model)
         writer.deprecatedShape(shape)
         val withoutDebug = containerMeta.derives.copy(derives = containerMeta.derives.derives - RuntimeType.Debug)
-        containerMeta.copy(derives = withoutDebug).render(writer)
+        val additionalAttributes = containerMeta.additionalAttributes.toMutableList();
+        additionalAttributes.add(Attribute.DerivePartialEqWithoutEq)
+        containerMeta.copy(
+            derives = withoutDebug,
+            additionalAttributes = additionalAttributes).render(writer)
 
         writer.rustBlock("struct $name ${lifetimeDeclaration()}") {
-            writer.forEachMember(members) { member, memberName, memberSymbol ->
+                writer.forEachMember(members) { member, memberName, memberSymbol ->
                 renderStructureMember(writer, member, memberName, memberSymbol)
             }
         }