variadic_from 0.59.0

Variadic from.
Documentation 
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// tests/compile_fail/test_4_fields.rs

#[ allow( dead_code ) ]
#[ derive( variadic_from ::VariadicFrom ) ]
struct Test4FieldsNamed
{
  a: i32,
  b: i32,
  c: i32,
  d: i32,
}