derive-ctor 1.0.3

Adds `#[derive(ctor)]` which allows for the auto-generation of struct, enum, and union constructors.
Documentation 
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use derive_ctor::ctor;

#[derive(ctor, Debug, PartialEq)]
enum SpecificVariantMethod {
    #[ctor(const pub new, other)]
    Variant1(i32),
}

#[test]
fn test_variant_with_configured_ctors() {
    const RESULT: SpecificVariantMethod = SpecificVariantMethod::new(15);
    assert_eq!(SpecificVariantMethod::Variant1(15), RESULT);

    let result2 = SpecificVariantMethod::other(30);
    assert_eq!(SpecificVariantMethod::Variant1(30), result2);
}

#[derive(ctor, Debug, PartialEq)]
enum EnumNoVariantGeneration {
    Variant1,
    #[ctor(none)]
    #[allow(dead_code)]
    Variant2,
}

#[test]
fn test_enum_with_specified_no_ctor_generation() {
    let variant = EnumNoVariantGeneration::variant1();
    assert_eq!(EnumNoVariantGeneration::Variant1, variant); // you'll have to take my word for it- variant2 does not get generated
}

#[derive(ctor, Debug, PartialEq)]
#[ctor(prefix = new, vis = pub)]
enum VariantConfigOverridesDefaults {
    Variant1,
    #[ctor(variant2)]
    Variant2,
    #[ctor(none)]
    #[allow(dead_code)]
    Variant3,
}

#[test]
fn test_variant_config_overrides_default_values() {
    let variant1 = VariantConfigOverridesDefaults::new_variant1();
    assert_eq!(VariantConfigOverridesDefaults::Variant1, variant1);

    let variant2 = VariantConfigOverridesDefaults::variant2();
    assert_eq!(VariantConfigOverridesDefaults::Variant2, variant2);

    // variant3 was not generated
}




#[derive(ctor, Debug, PartialEq)]
enum DefaultVariantEnum {
    #[allow(dead_code)]
    Variant1,
    #[ctor(default)]
    Variant2 { #[ctor(default)] value: i32 }
}

#[test]
fn test_default_variant_enum() {
    let variant2 = Default::default();
    assert_eq!(DefaultVariantEnum::Variant2 { value: 0 }, variant2);
}

#[derive(ctor, Debug, PartialEq)]
enum DefaultAllEnum {
    #[allow(dead_code)]
    Variant1,
    #[ctor(default(all))]
    Variant2 { value: i32, #[ctor(expr("A".to_string()))] other: String }
}

#[test]
fn test_default_all_variant_enum() {
    let variant2 = Default::default();
    assert_eq!(DefaultAllEnum::Variant2 { value: 0, other: "A".to_string() }, variant2)
}