oneof 0.2.0

Enum variant projection — access one variant at a time
Documentation 
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#[test]
fn conflicting_variants() {
    let t = trybuild::TestCases::new();
    t.compile_fail("tests/fail/conflicting_variants.rs");
}

#[test]
fn not_an_enum() {
    let t = trybuild::TestCases::new();
    t.compile_fail("tests/fail/not_an_enum.rs");
}

#[test]
fn self_keyword_conflict() {
    let t = trybuild::TestCases::new();
    t.compile_fail("tests/fail/self_keyword.rs");
}