error_set 0.9.1

Quick error declarations and automatic conversions between errors for precisely typed error handling. Inspired by Zig's error set type.
Documentation 
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error: 'X' already exists as an error enum.
  --> tests/trybuild/two_enums_same_name.rs:3:1
   |
3  | / error_set! {
4  | |     X := {
5  | |         IoError2,
...  |
10 | | }
   | |_^
   |
   = note: this error originates in the macro `error_set` (in Nightly builds, run with -Z macro-backtrace for more info)