Remove implicit this for now

example/src/main.nub

@@ -1,16 +1,6 @@
 extern func puts(fmt: cstring)
 
-interface Printable
-{
-    func print()
-}
-
-interface Stringable
-{
-    func str(): cstring
-}
-
-struct Human : Printable, Stringable
+struct Human
 {
     name: cstring
 
@@ -18,11 +8,6 @@ struct Human : Printable, Stringable
     {
         return this.name
     }
-
-    func print()
-    {
-        puts(this.str())
-    }
 }
 
 func main(args: []cstring): i64
@@ -32,7 +17,6 @@ func main(args: []cstring): i64
     }
 
     puts(human.str())
-    // human.print()
 
     return 0
 }

src/compiler/NubLang/Generation/QBE/QBEGenerator.Expression.cs

@@ -413,12 +413,10 @@ public partial class QBEGenerator
 
     private Val EmitStructFuncAccess(StructFuncAccessNode structFuncAccess)
     {
-        var target = EmitUnwrap(EmitExpression(structFuncAccess.Target));
-
         var structDef = _definitionTable.LookupStruct(structFuncAccess.StructType.Name);
         var func = StructFuncName(structDef.Name, structFuncAccess.Func);
 
-        return new Val(func, structFuncAccess.Type, ValKind.Direct, target);
+        return new Val(func, structFuncAccess.Type, ValKind.Direct);
     }
 
     private Val EmitInterfaceFuncAccess(InterfaceFuncAccessNode interfaceFuncAccess)
@@ -438,13 +436,7 @@ public partial class QBEGenerator
         var func = TmpName();
         _writer.Indented($"{func} =l loadl {funcOffset}");
 
-        var dataPointer = TmpName();
-        _writer.Indented($"{dataPointer} =l add {target}, 8");
-
-        var data = TmpName();
-        _writer.Indented($"{data} =l loadl {dataPointer}");
-
-        return new Val(func, interfaceFuncAccess.Type, ValKind.Direct, data);
+        return new Val(func, interfaceFuncAccess.Type, ValKind.Direct);
     }
 
     private Val EmitInterfaceInitializer(InterfaceInitializerNode interfaceInitializer, string? destination = null)
@@ -484,10 +476,6 @@ public partial class QBEGenerator
         var expression = EmitExpression(funcCall.Expression);
 
         var parameterStrings = new List<string>();
-        if (expression.ThisArg != null)
-        {
-            parameterStrings.Add($"l {expression.ThisArg}");
-        }
 
         foreach (var parameter in funcCall.Parameters)
         {

src/compiler/NubLang/Generation/QBE/QBEGenerator.cs

@@ -623,7 +623,7 @@ public class CStringLiteral(string value, string name)
     public string Name { get; } = name;
 }
 
-public record Val(string Name, TypeNode Type, ValKind Kind, string? ThisArg = null);
+public record Val(string Name, TypeNode Type, ValKind Kind);
 
 public class Scope(Scope? parent = null)
 {

src/compiler/NubLang/Parsing/Parser.cs

@@ -66,16 +66,11 @@ public sealed class Parser
         return new SyntaxTree(GetTokens(_tokenIndex), definitions);
     }
 
-    private FuncSignatureSyntax ParseFuncSignature(TypeSyntax? thisArg = null)
+    private FuncSignatureSyntax ParseFuncSignature()
     {
         var startIndex = _tokenIndex;
         List<FuncParameterSyntax> parameters = [];
 
-        if (thisArg != null)
-        {
-            parameters.Add(new FuncParameterSyntax([], "this", thisArg));
-        }
-
         ExpectSymbol(Symbol.OpenParen);
 
         while (!TryExpectSymbol(Symbol.CloseParen))
@@ -175,7 +170,7 @@ public sealed class Parser
             if (TryExpectSymbol(Symbol.Func))
             {
                 var funcName = ExpectIdentifier().Value;
-                var funcSignature = ParseFuncSignature(new CustomTypeSyntax([], name.Value));
+                var funcSignature = ParseFuncSignature();
                 var funcBody = ParseBlock();
 
                 funcs.Add(new StructFuncSyntax(GetTokens(memberStartIndex), funcName, funcSignature, funcBody));