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: unions are not supported, only structs
#[derive(TypeStateBuilder)]
union NotAStruct {
    field1: u32,
    field2: f32,
}
fn main() {}