#[serde(default)] is ignored in newtype structs, newtype variants, tuple structs and tuple variants

[hcpl]

#[derive(Deserialize)]
struct Foo;

#[derive(Deserialize)]
// should error with "the trait `std::default::Default` is not implemented for `Foo`"
struct Boom(#[serde(default)] Foo);

#[derive(Deserialize)]
// should error with "the trait `std::default::Default` is not implemented for `Foo`"
struct Bar(#[serde(default)] Foo, Foo);

#[derive(Deserialize)]
enum Badum {
    // should error with "the trait `std::default::Default` is not implemented for `Foo`"
    Tss(#[serde(default)] Foo),
}

#[derive(Deserialize)]
enum Baz {
    // should error with "the trait `std::default::Default` is not implemented for `Foo`"
    Spam(#[serde(default)] Foo, Foo),
}

EDIT: also ignored in newtype structs and newtype variants.

Playground.

[Mingun]

Currently only

#[derive(Deserialize)]
enum Badum {
    // should error with "the trait `std::default::Default` is not implemented for `Foo`"
    Tss(#[serde(default)] Foo),
}

case doesn't produce an error, because of #2105, so this issue can be closed as duplicate of #2105.