variadic_from 0.59.0

Variadic from.
Documentation 
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error[E0601]: `main` function not found in crate `$CRATE`
 --> tests/compile_fail/test_0_fields.rs:5:27
  |
5 | struct Test0FieldsNamed {}
  |                           ^ consider adding a `main` function to `$DIR/tests/compile_fail/test_0_fields.rs`