error: field must have #[serde(default)] because previous field 0 has #[serde(default)]
  --> tests/ui/default-attribute/tuple_struct.rs:16:33
   |
16 | struct T2(#[serde(default)] u8, u8, u8);
   |                                 ^^

error: field must have #[serde(default)] because previous field 0 has #[serde(default)]
  --> tests/ui/default-attribute/tuple_struct.rs:16:37
   |
16 | struct T2(#[serde(default)] u8, u8, u8);
   |                                     ^^