diff --git a/src/Riok.Mapperly/Descriptors/MappingBuilders/EnumerableMappingBuilder.cs b/src/Riok.Mapperly/Descriptors/MappingBuilders/EnumerableMappingBuilder.cs
index 615eca1074..d3022b3d07 100644
--- a/src/Riok.Mapperly/Descriptors/MappingBuilders/EnumerableMappingBuilder.cs
+++ b/src/Riok.Mapperly/Descriptors/MappingBuilders/EnumerableMappingBuilder.cs
@@ -40,8 +40,8 @@ public static class EnumerableMappingBuilder
         if (elementMapping == null)
             return null;
 
-        if (TryBuildCastMapping(ctx, elementMapping) is { } implicitMapping)
-            return implicitMapping;
+        if (TryBuildCastMapping(ctx, elementMapping) is { } castMapping)
+            return castMapping;
 
         if (TryBuildFastConversion(ctx, elementMapping) is { } fastLoopMapping)
             return fastLoopMapping;
@@ -149,7 +149,9 @@ ForEachAddEnumerableExistingTargetMapping CreateForEach(string methodName)
             || !ctx.CollectionInfos!.Source.CountIsKnown
             || ctx.CollectionInfos.Target.CollectionType == CollectionType.None
         )
+        {
             return null;
+        }
 
         // if target is a list or type implemented by list
         if (ctx.CollectionInfos.Target.CollectionType is CollectionType.List or CollectionType.ICollection or CollectionType.IList)
@@ -185,15 +187,15 @@ or CollectionType.IEnumerable
             return null;
 
         // upgrade nullability of element type
-        var targetValue = ((INamedTypeSymbol)ctx.CollectionInfos!.Target.Type.OriginalDefinition).Construct(elementMapping.TargetType);
-        var targetCollection = ctx.Types.Get(typeof(List<>)).Construct(elementMapping.TargetType);
+        var targetType = ((INamedTypeSymbol)ctx.CollectionInfos!.Target.Type.OriginalDefinition).Construct(elementMapping.TargetType);
+        var targetTypeToInstantiate = ctx.Types.Get(typeof(List<>)).Construct(elementMapping.TargetType);
 
         return new ForEachAddEnumerableMapping(
             ctx.Source,
-            targetValue,
+            targetType,
             elementMapping,
             AddMethodName,
-            targetCollection,
+            targetTypeToInstantiate,
             ctx.CollectionInfos.Source.CountPropertyName
         );
     }
@@ -206,11 +208,11 @@ private static NewInstanceMapping BuildArrayToArrayMapping(MappingBuilderContext
         if (!elementMapping.IsSynthetic)
         {
             // upgrade nullability of element type
-            var targetValue =
+            var targetType =
                 ctx.CollectionInfos!.Target.CollectionType == CollectionType.Array
                     ? ctx.Types.GetArrayType(elementMapping.TargetType)
                     : ((INamedTypeSymbol)ctx.Target).ConstructedFrom.Construct(elementMapping.TargetType);
-            return new ArrayForMapping(ctx.Source, targetValue, elementMapping, elementMapping.TargetType);
+            return new ArrayForMapping(ctx.Source, targetType, elementMapping, elementMapping.TargetType);
         }
 
         return ctx.MapperConfiguration.UseDeepCloning
@@ -225,14 +227,14 @@ private static NewInstanceMapping BuildArrayToArrayMapping(MappingBuilderContext
             return null;
 
         // upgrade nullability of element type
-        var targetValue =
+        var targetType =
             ctx.CollectionInfos!.Target.CollectionType == CollectionType.Array
                 ? ctx.Types.GetArrayType(elementMapping.TargetType)
                 : ((INamedTypeSymbol)ctx.Target).ConstructedFrom.Construct(elementMapping.TargetType);
 
         return new ArrayForEachMapping(
             ctx.Source,
-            targetValue,
+            targetType,
             elementMapping,
             elementMapping.TargetType,
             ctx.CollectionInfos.Source.CountPropertyName!
diff --git a/src/Riok.Mapperly/Descriptors/Mappings/INewInstanceObjectMemberMapping.cs b/src/Riok.Mapperly/Descriptors/Mappings/INewInstanceObjectMemberMapping.cs
index b57aa6fc8b..26e1e8ef2c 100644
--- a/src/Riok.Mapperly/Descriptors/Mappings/INewInstanceObjectMemberMapping.cs
+++ b/src/Riok.Mapperly/Descriptors/Mappings/INewInstanceObjectMemberMapping.cs
@@ -5,7 +5,7 @@ namespace Riok.Mapperly.Descriptors.Mappings;
 /// <summary>
 /// An object mapping creating the target instance via a new() call.
 /// </summary>
-public interface INewInstanceObjectMemberMapping : IMapping
+public interface INewInstanceObjectMemberMapping : INewInstanceMapping
 {
     void AddConstructorParameterMapping(ConstructorParameterMapping mapping);
 
diff --git a/src/Riok.Mapperly/Descriptors/Mappings/INewValueTupleMapping.cs b/src/Riok.Mapperly/Descriptors/Mappings/INewValueTupleMapping.cs
index 95e25e465c..695a5adfba 100644
--- a/src/Riok.Mapperly/Descriptors/Mappings/INewValueTupleMapping.cs
+++ b/src/Riok.Mapperly/Descriptors/Mappings/INewValueTupleMapping.cs
@@ -5,7 +5,7 @@ namespace Riok.Mapperly.Descriptors.Mappings;
 /// <summary>
 /// A tuple mapping creating the target instance via a tuple expression (eg. (A: 10, B: 20)).
 /// </summary>
-public interface INewValueTupleMapping : IMapping
+public interface INewValueTupleMapping : INewInstanceMapping
 {
     void AddConstructorParameterMapping(ValueTupleConstructorParameterMapping mapping);
 }
diff --git a/src/Riok.Mapperly/Helpers/CompilationExtensions.cs b/src/Riok.Mapperly/Helpers/CompilationExtensions.cs
index 62c3a9becb..e994a07f31 100644
--- a/src/Riok.Mapperly/Helpers/CompilationExtensions.cs
+++ b/src/Riok.Mapperly/Helpers/CompilationExtensions.cs
@@ -58,7 +58,10 @@ internal static class CompilationExtensions
 
         return type;
 #else
+        // RS0030 banned api: GetTypesByMetadataName is not supported for Roslyn < 4.4
+#pragma warning disable RS0030
         return compilation.GetTypeByMetadataName(fullyQualifiedMetadataName);
+#pragma warning restore RS0030
 #endif
     }
 
diff --git a/src/Riok.Mapperly/Helpers/FieldSymbolEqualityComparer.cs b/src/Riok.Mapperly/Helpers/FieldSymbolEqualityComparer.cs
index c69ee920b7..dd8d24582a 100644
--- a/src/Riok.Mapperly/Helpers/FieldSymbolEqualityComparer.cs
+++ b/src/Riok.Mapperly/Helpers/FieldSymbolEqualityComparer.cs
@@ -4,5 +4,5 @@ namespace Riok.Mapperly.Helpers;
 
 internal static class FieldSymbolEqualityComparer
 {
-    public static IEqualityComparer<IFieldSymbol?> Default = SymbolEqualityComparer.Default;
+    public static readonly IEqualityComparer<IFieldSymbol?> Default = SymbolEqualityComparer.Default;
 }
diff --git a/test/Riok.Mapperly.Tests/Mapping/UserMethodTest.cs b/test/Riok.Mapperly.Tests/Mapping/UserMethodTest.cs
index f2fef9e530..b8ffc43b47 100644
--- a/test/Riok.Mapperly.Tests/Mapping/UserMethodTest.cs
+++ b/test/Riok.Mapperly.Tests/Mapping/UserMethodTest.cs
@@ -15,43 +15,45 @@ public Task WithNamespaceShouldWork()
     [Fact]
     public Task InstanceMapperShouldEmitDiagnosticForPartialStaticMethods()
     {
-        var source =
-            @"
-using System;
-using System.Collections.Generic;
-using Riok.Mapperly.Abstractions;
-
-[Mapper]
-public partial class MyMapper
-{
-    public static object StaticToObject(string s);
+        var source = TestSourceBuilder.CSharp(
+            """
+            using System;
+            using System.Collections.Generic;
+            using Riok.Mapperly.Abstractions;
 
-    public partial object InstanceToObject(string s);
-}
-";
+            [Mapper]
+            public partial class MyMapper
+            {
+                public static object StaticToObject(string s);
+
+                public partial object InstanceToObject(string s);
+            }
+            """
+        );
         return TestHelper.VerifyGenerator(source);
     }
 
     [Fact]
     public Task InstanceMapperShouldSupportUserDefinedStaticMethods()
     {
-        var source =
-            @"
-using System;
-using System.Collections.Generic;
-using Riok.Mapperly.Abstractions;
-
-[Mapper]
-public partial class MyMapper
-{
-    public static int StaticMapper(int s) => s;
+        var source = TestSourceBuilder.CSharp(
+            """
+            using System;
+            using System.Collections.Generic;
+            using Riok.Mapperly.Abstractions;
 
-    public partial B Map(A s);
-}
+            [Mapper]
+            public partial class MyMapper
+            {
+                public static int MapInt(int s) => s;
+
+                public partial B Map(A s);
+            }
 
-public record A(int Value);
-public record B(int Value);
-";
+            public record A(int Value);
+            public record B(int Value);
+            """
+        );
         return TestHelper.VerifyGenerator(source);
     }
 
@@ -59,7 +61,10 @@ public record B(int Value);
     public Task InstanceMapperShouldUseStaticExistingTargetMethod()
     {
         var source = TestSourceBuilder.MapperWithBodyAndTypes(
-            "partial B Map(A s);" + "static void StaticMapper(List<int> src, List<string> dst) { }",
+            """
+            partial B Map(A s);"
+            static void MapList(List<int> src, List<string> dst) { }
+            """,
             "class A { public List<int> Value { get; set; } }",
             "public class B { public List<string> Value { get; } }"
         );
diff --git a/test/Riok.Mapperly.Tests/_snapshots/UserMethodTest.InstanceMapperShouldSupportUserDefinedStaticMethods#MyMapper.g.verified.cs b/test/Riok.Mapperly.Tests/_snapshots/UserMethodTest.InstanceMapperShouldSupportUserDefinedStaticMethods#MyMapper.g.verified.cs
index 37d13cee80..bf2b767370 100644
--- a/test/Riok.Mapperly.Tests/_snapshots/UserMethodTest.InstanceMapperShouldSupportUserDefinedStaticMethods#MyMapper.g.verified.cs
+++ b/test/Riok.Mapperly.Tests/_snapshots/UserMethodTest.InstanceMapperShouldSupportUserDefinedStaticMethods#MyMapper.g.verified.cs
@@ -5,7 +5,7 @@ public partial class MyMapper
 {
     public partial global::B Map(global::A s)
     {
-        var target = new global::B(StaticMapper(s.Value));
+        var target = new global::B(MapInt(s.Value));
         return target;
     }
-}
\ No newline at end of file
+}
diff --git a/test/Riok.Mapperly.Tests/_snapshots/UserMethodTest.InstanceMapperShouldUseStaticExistingTargetMethod#Mapper.g.verified.cs b/test/Riok.Mapperly.Tests/_snapshots/UserMethodTest.InstanceMapperShouldUseStaticExistingTargetMethod#Mapper.g.verified.cs
index 37b82dce36..820b7aec2d 100644
--- a/test/Riok.Mapperly.Tests/_snapshots/UserMethodTest.InstanceMapperShouldUseStaticExistingTargetMethod#Mapper.g.verified.cs
+++ b/test/Riok.Mapperly.Tests/_snapshots/UserMethodTest.InstanceMapperShouldUseStaticExistingTargetMethod#Mapper.g.verified.cs
@@ -6,7 +6,7 @@ public partial class Mapper
     private partial global::B Map(global::A s)
     {
         var target = new global::B();
-        StaticMapper(s.Value, target.Value);
+        MapList(s.Value, target.Value);
         return target;
     }
-}
\ No newline at end of file
+}