arg_enum_proc_macro 0.3.4

A procedural macro compatible with clap arg_enum
Documentation 
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error: proc-macro derive panicked
 --> $DIR/complex-enum.rs:9:10
  |
9 | #[derive(ArgEnum)]
  |          ^^^^^^^
  |
  = help: message: Only enum with unit variants are supported!
          Variant Complex::B is not an unit variant