Implemented variable scopes

src/build/core/Function.go

@@ -36,8 +36,8 @@ func NewFunction(name string, file *fs.File, body token.List) *Function {
 				Syscall: x64.SyscallRegisters,
 				Output:  x64.ReturnValueRegisters,
 			},
-			variables: map[string]*Variable{},
-			finished:  make(chan struct{}),
+			scopes:   []Scope{{}},
+			finished: make(chan struct{}),
 		},
 	}
 }