nestum 0.3.2

Proc-macro for nested enum paths like Enum1::Variant1::VariantA
Documentation 
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error: invalid #[nestum] on variant; use #[nestum(external = "path::to::Enum")]
 --> tests/ui/fail_external_empty_args.rs:8:5
  |
8 |     #[nestum()]
  |     ^