filio: Update closefd, closed when close method is called

Author: corona10

tests/snippets/stdlib_io.py

@@ -28,11 +28,14 @@
 fi = FileIO('README.md')
 fi.read()
 fi.close()
+assert fi.closefd
+assert fi.closed
+
 with assertRaises(ValueError):
     fi.read()
 
 with FileIO('README.md') as fio:
 	nres = fio.read(1)
 	assert len(nres) == 1
 	nres = fio.read(2)
-	assert len(nres) == 2
+	assert len(nres) == 2

vm/src/stdlib/io.rs

@@ -460,6 +460,8 @@ fn file_io_close(vm: &VirtualMachine, args: PyFuncArgs) -> PyResult {
     unsafe {
         kernel32::CloseHandle(raw_handle);
     }
+    vm.set_attr(file_io, "closefd", vm.new_bool(true))?;
+    vm.set_attr(file_io, "closed", vm.new_bool(true))?;
     Ok(vm.ctx.none())
 }
 
@@ -471,6 +473,8 @@ fn file_io_close(vm: &VirtualMachine, args: PyFuncArgs) -> PyResult {
     unsafe {
         libc::close(raw_fd);
     }
+    vm.set_attr(file_io, "closefd", vm.new_bool(true))?;
+    vm.set_attr(file_io, "closed", vm.new_bool(true))?;
     Ok(vm.ctx.none())
 }