blanket 0.4.0

A simple macro to derive blanket implementations for your traits.
Documentation
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error[E0080]: evaluation of constant value failed
  --> tests/derive_ref/fails/noderive.rs:27:5
   |
27 |     const_assert!(impls!(&AtomicCounter:     Counter));
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ attempt to compute `0_usize - 1_usize`, which would overflow
   |
   = note: this error originates in the macro `const_assert` (in Nightly builds, run with -Z macro-backtrace for more info)