variadic_from 0.59.0

Variadic from.
Documentation 
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error[E0601]: `main` function not found in crate `$CRATE`
  --> tests/compile_fail/test_4_fields.rs:11:2
   |
11 | }
   |  ^ consider adding a `main` function to `$DIR/tests/compile_fail/test_4_fields.rs`