serde/test_suite/tests/ui/conflict/alias.rs

use serde_derive::Deserialize;

#[derive(Deserialize)]
struct S1 {
    /// Expected error on "alias b", because this is a name of other field
    /// Error on "alias a" is not expected because this is a name of this field
    /// Error on "alias c" is not expected because field `c` is skipped
    #[serde(alias = "a", alias = "b", alias = "c")]
    a: (),

    /// Expected error on "alias c", because it is already used as alias of `a`
    #[serde(alias = "c")]
    b: (),

    #[serde(skip_deserializing)]
    c: (),
}

#[derive(Deserialize)]
struct S2 {
    /// Expected error on "alias c", because this is a name of other field after
    /// applying rename rules
    #[serde(alias = "b", alias = "c")]
    a: (),

    #[serde(rename = "c")]
    b: (),
}

#[derive(Deserialize)]
#[serde(rename_all = "UPPERCASE")]
struct S3 {
    /// Expected error on "alias B", because this is a name of field after
    /// applying rename rules
    #[serde(alias = "B", alias = "c")]
    a: (),
    b: (),
}

fn main() {
    @//fail
}