Fixed null comparison.

Author: jscarle

Diff for: src/LightResults.Extensions.GeneratedIdentifier/GeneratedIdentifierSourceGenerator.cs

@@ -382,7 +382,13 @@ public override int GetHashCode()
                                         /// <returns><c>true</c> if the instances are equal; otherwise, <c>false</c>.</returns>
                                         public static bool operator ==({{symbolName}}? left, {{symbolName}}? right)
                                         {
-                                            return left is not null && left.Equals(right);
+                                            if (left is null && right is null)
+                                                return true;
+                                            if (left is null || right is null)
+                                                return false;
+                                            if (ReferenceEquals(left, right))
+                                                return true;
+                                            return left.Equals(right);
                                         }
 
                                     """
@@ -409,7 +415,13 @@ public override int GetHashCode()
                                         /// <returns><c>true</c> if the instances are not equal; otherwise, <c>false</c>.</returns>
                                         public static bool operator !=({{symbolName}}? left, {{symbolName}}? right)
                                         {
-                                            return left is null || !left.Equals(right);
+                                            if (left is null && right is null)
+                                                return false;
+                                            if (left is null || right is null)
+                                                return true;
+                                            if (ReferenceEquals(left, right))
+                                                return false;
+                                            return !left.Equals(right);
                                         }
 
                                     """

Diff for: src/LightResults.Extensions.GeneratedIdentifier/LightResults.Extensions.GeneratedIdentifier.csproj

@@ -36,7 +36,7 @@
     <!-- Output -->
     <PropertyGroup>
         <AssemblyName>LightResults.Extensions.GeneratedIdentifier</AssemblyName>
-        <Version>9.0.0-preview.9</Version>
+        <Version>9.0.0-preview.10</Version>
         <AssemblyVersion>9.0.0.0</AssemblyVersion>
         <FileVersion>9.0.0.0</FileVersion>
         <NeutralLanguage>en-US</NeutralLanguage>

Diff for: tests/LightResults.Extensions.GeneratedIdentifier.Tests/GeneratedIdentifierSourceGeneratorTests.GenerateStringIdentifier_WithNamespace.verified.txt

@@ -91,7 +91,13 @@ public sealed partial class TestStringId :
     /// <returns><c>true</c> if the instances are equal; otherwise, <c>false</c>.</returns>
     public static bool operator ==(TestStringId? left, TestStringId? right)
     {
-        return left is not null && left.Equals(right);
+        if (left is null && right is null)
+            return true;
+        if (left is null || right is null)
+            return false;
+        if (ReferenceEquals(left, right))
+            return true;
+        return left.Equals(right);
     }
 
     /// <summary>Determines whether two instances of <see cref="TestStringId" /> are not equal.</summary>
@@ -100,7 +106,13 @@ public sealed partial class TestStringId :
     /// <returns><c>true</c> if the instances are not equal; otherwise, <c>false</c>.</returns>
     public static bool operator !=(TestStringId? left, TestStringId? right)
     {
-        return left is null || !left.Equals(right);
+        if (left is null && right is null)
+            return false;
+        if (left is null || right is null)
+            return true;
+        if (ReferenceEquals(left, right))
+            return false;
+        return !left.Equals(right);
     }
 
     /// <inheritdoc />

Diff for: tests/LightResults.Extensions.GeneratedIdentifier.Tests/GeneratedIdentifierSourceGeneratorTests.GenerateStringIdentifier_WithoutNamespace.verified.txt

@@ -89,7 +89,13 @@ public sealed partial class TestStringId :
     /// <returns><c>true</c> if the instances are equal; otherwise, <c>false</c>.</returns>
     public static bool operator ==(TestStringId? left, TestStringId? right)
     {
-        return left is not null && left.Equals(right);
+        if (left is null && right is null)
+            return true;
+        if (left is null || right is null)
+            return false;
+        if (ReferenceEquals(left, right))
+            return true;
+        return left.Equals(right);
     }
 
     /// <summary>Determines whether two instances of <see cref="TestStringId" /> are not equal.</summary>
@@ -98,7 +104,13 @@ public sealed partial class TestStringId :
     /// <returns><c>true</c> if the instances are not equal; otherwise, <c>false</c>.</returns>
     public static bool operator !=(TestStringId? left, TestStringId? right)
     {
-        return left is null || !left.Equals(right);
+        if (left is null && right is null)
+            return false;
+        if (left is null || right is null)
+            return true;
+        if (ReferenceEquals(left, right))
+            return false;
+        return !left.Equals(right);
     }
 
     /// <inheritdoc />