Fix handling of implicitly declared EqualityContract on record types in validation generator

src/Shared/RoslynUtils/WellKnownTypeData.cs

@@ -123,6 +123,7 @@ public enum WellKnownType
  System_ComponentModel_DataAnnotations_ValidationAttribute,
  System_ComponentModel_DataAnnotations_RequiredAttribute,
  System_ComponentModel_DataAnnotations_CustomValidationAttribute,
+ System_Type,
  }
 
  public static string[] WellKnownTypeNames =
@@ -243,5 +244,6 @@ public enum WellKnownType
  "System.ComponentModel.DataAnnotations.ValidationAttribute",
  "System.ComponentModel.DataAnnotations.RequiredAttribute",
  "System.ComponentModel.DataAnnotations.CustomValidationAttribute",
+ "System.Type",
  ];
 }

src/Validation/gen/Extensions/ISymbolExtensions.cs

@@ -3,6 +3,7 @@
 
 using System;
 using System.Linq;
+using Microsoft.AspNetCore.App.Analyzers.Infrastructure;
 using Microsoft.CodeAnalysis;
 
 namespace Microsoft.Extensions.Validation;
@@ -32,4 +33,9 @@ attribute.AttributeClass is { } attributeClass &&
 
  return property.Name;
  }
+
+ public static bool IsEqualityContract(this IPropertySymbol prop, WellKnownTypes wellKnownTypes) =>
+ prop.Name == "EqualityContract"
+ && SymbolEqualityComparer.Default.Equals(prop.Type, wellKnownTypes.Get(WellKnownTypeData.WellKnownType.System_Type))
+ && prop.DeclaredAccessibility == Accessibility.Protected;
 }

src/Validation/gen/Parsers/ValidationsGenerator.TypesParser.cs

@@ -162,7 +162,9 @@ internal ImmutableArray<ValidatableProperty> ExtractValidatableMembers(ITypeSymb
  {
  // Skip compiler generated properties and properties already processed via
  // the record processing logic above.
- if (member.IsImplicitlyDeclared || resolvedRecordProperty.Contains(member, SymbolEqualityComparer.Default))
+ if (member.IsImplicitlyDeclared 
+ || member.IsEqualityContract(wellKnownTypes) 
+ || resolvedRecordProperty.Contains(member, SymbolEqualityComparer.Default))
  {
  continue;
  }