Moved register state to scopes

src/build/core/Function.go

@@ -36,7 +36,9 @@ func NewFunction(name string, file *fs.File, body token.List) *Function {
 				Syscall: x64.SyscallRegisters,
 				Output:  x64.ReturnValueRegisters,
 			},
-			scopes:   []Scope{{}},
+			scopes: []*Scope{
+				{variables: map[string]*Variable{}},
+			},
 			finished: make(chan struct{}),
 		},
 	}
@@ -52,14 +54,14 @@ func (f *Function) Compile() {
 
 // CompileTokens compiles a token list.
 func (f *Function) CompileTokens(tokens token.List) error {
-	tree, err := ast.Parse(tokens)
+	body, err := ast.Parse(tokens)
 
 	if err != nil {
 		err.(*errors.Error).File = f.File
 		return err
 	}
 
-	return f.CompileAST(tree)
+	return f.CompileAST(body)
 }
 
 // CompileAST compiles an abstract syntax tree.
@@ -97,7 +99,7 @@ func (f *Function) CompileASTNode(node ast.Node) error {
 		return f.CompileLoop(node)
 
 	default:
-		panic("Unknown AST type")
+		panic("unknown AST type")
 	}
 }