Placed additional symbols into respective class

src/Draco.Compiler/Internal/Symbols/Metadata/MetadataNamespaceSymbol.cs

@@ -57,7 +57,7 @@ private ImmutableArray<Symbol> BuildMembers()
             var symbol = MetadataSymbol.ToSymbol(this, typeDef);
             result.Add(symbol);
             // Add additional symbols
-            result.AddRange(GetAdditionalSymbols(symbol));
+            result.AddRange(symbol.GetAdditionalSymbols());
         }
 
         // Done

src/Draco.Compiler/Internal/Symbols/Metadata/MetadataStaticClassSymbol.cs

@@ -67,7 +67,7 @@ private ImmutableArray<Symbol> BuildMembers()
             var symbol = MetadataSymbol.ToSymbol(this, typeDef);
             result.Add(symbol);
             // Add additional symbols
-            result.AddRange(GetAdditionalSymbols(symbol));
+            result.AddRange(symbol.GetAdditionalSymbols());
         }
 
         // Methods

src/Draco.Compiler/Internal/Symbols/Metadata/MetadataTypeSymbol.cs

@@ -156,7 +156,7 @@ private ImmutableArray<Symbol> BuildMembers()
             var symbol = MetadataSymbol.ToSymbol(this, typeDef);
             result.Add(symbol);
             // Add additional symbols
-            result.AddRange(GetAdditionalSymbols(symbol));
+            result.AddRange(symbol.GetAdditionalSymbols());
         }
 
         // Methods

src/Draco.Compiler/Internal/Symbols/Script/ScriptModuleSymbol.cs

@@ -89,7 +89,7 @@ private ImmutableArray<Symbol> BindMembers(IBinderProvider binderProvider)
 
             var earlierMember = result.FirstOrDefault(s => s.Name == member.Name);
             result.Add(member);
-            result.AddRange(GetAdditionalSymbols(member));
+            result.AddRange(member.GetAdditionalSymbols());
 
             // We check for illegal shadowing
             if (earlierMember is null) continue;

src/Draco.Compiler/Internal/Symbols/Source/SourceModuleSymbol.cs

@@ -77,7 +77,7 @@ private ImmutableArray<Symbol> BindMembers(IBinderProvider binderProvider)
         {
             var earlierMember = result.FirstOrDefault(s => s.Name == member.Name);
             result.Add(member);
-            result.AddRange(GetAdditionalSymbols(member));
+            result.AddRange(member.GetAdditionalSymbols());
 
             // We check for illegal shadowing
             if (earlierMember is null) continue;

src/Draco.Compiler/Internal/Symbols/Symbol.cs

@@ -333,28 +333,10 @@ private protected string GenericsToString()
         _ => throw new InvalidOperationException($"illegal visibility modifier token {kind}"),
     };
 
-    // TODO: We could have this as a base member for symbols
     /// <summary>
-    /// Retrieves additional symbols for the given symbol that should live in the same scope as the symbol itself.
+    /// Retrieves additional symbols for this symbol that should live in the same scope as this symbol itself.
     /// This returns the constructor functions for types for example.
     /// </summary>
-    /// <param name="symbol">The symbol to get additional symbols for.</param>
-    /// <returns>The additional symbols for the given <paramref name="symbol"/>.</returns>
-    public static IEnumerable<Symbol> GetAdditionalSymbols(Symbol symbol)
-    {
-        switch (symbol)
-        {
-        case TypeSymbol typeSymbol:
-            if (typeSymbol.IsAbstract) yield break;
-            // For non-abstract types we provide constructor functions
-            foreach (var ctor in typeSymbol.Constructors) yield return new ConstructorFunctionSymbol(ctor);
-            break;
-        case SyntaxAutoPropertySymbol autoProp:
-            // For auto-properties we provide the backing field and the accessors in the same scope
-            if (autoProp.Getter is not null) yield return autoProp.Getter;
-            if (autoProp.Setter is not null) yield return autoProp.Setter;
-            yield return autoProp.BackingField;
-            break;
-        }
-    }
+    /// <returns>The additional symbols for this symbol.</returns>
+    protected internal virtual IEnumerable<Symbol> GetAdditionalSymbols() => [];
 }

src/Draco.Compiler/Internal/Symbols/Syntax/SyntaxAutoPropertySymbol.cs

@@ -8,6 +8,7 @@
 using Draco.Compiler.Internal.Symbols.Source;
 using Draco.Compiler.Internal.Utilities;
 using Draco.Compiler.Internal.Symbols.Synthetized.AutoProperty;
+using System.Collections.Generic;
 
 namespace Draco.Compiler.Internal.Symbols.Syntax;
 
@@ -63,4 +64,12 @@ private SymbolDocumentation BuildDocumentation() =>
     private FunctionSymbol BuildGetter() => new AutoPropertyGetterSymbol(this.ContainingSymbol, this);
     private FunctionSymbol? BuildSetter() => new AutoPropertySetterSymbol(this.ContainingSymbol, this);
     private FieldSymbol BuildBackingField() => new AutoPropertyBackingFieldSymbol(this.ContainingSymbol, this);
+
+    protected internal override sealed IEnumerable<Symbol> GetAdditionalSymbols()
+    {
+        // For auto-properties we provide the backing field and the accessors in the same scope
+        if (this.Getter is not null) yield return this.Getter;
+        if (this.Setter is not null) yield return this.Setter;
+        yield return this.BackingField;
+    }
 }

src/Draco.Compiler/Internal/Symbols/TypeSymbol.cs

@@ -4,6 +4,7 @@
 using System.Linq;
 using Draco.Compiler.Api.Semantics;
 using Draco.Compiler.Internal.Symbols.Generic;
+using Draco.Compiler.Internal.Symbols.Synthetized;
 using Draco.Compiler.Internal.Utilities;
 
 namespace Draco.Compiler.Internal.Symbols;
@@ -213,4 +214,11 @@ public override TypeSymbol GenericInstantiate(Symbol? containingSymbol, GenericC
     public override TResult Accept<TResult>(SymbolVisitor<TResult> visitor) => visitor.VisitType(this);
 
     public override abstract string ToString();
+
+    protected internal override sealed IEnumerable<Symbol> GetAdditionalSymbols()
+    {
+        if (this.IsAbstract) yield break;
+        // For non-abstract types we provide constructor functions
+        foreach (var ctor in this.Constructors) yield return new ConstructorFunctionSymbol(ctor);
+    }
 }