type-state-builder 0.5.1

Type-state builder pattern derive macro with compile-time safety and enhanced ergonomics.
Documentation 
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use type_state_builder::TypeStateBuilder;

// This should be an error: enums are not supported, only structs
#[derive(TypeStateBuilder)]
enum NotAStruct {
    Variant1(String),
    Variant2 { field: u32 },
}

fn main() {}