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: Cycle Detected: BookParsingError->BookSectionParsingError->BookParsingError
 --> tests/trybuild/recursive_dependency.rs:7:5
  |
7 |     BookParsingError := {
  |     ^^^^^^^^^^^^^^^^

error[E0601]: `main` function not found in crate `$CRATE`
  --> tests/trybuild/recursive_dependency.rs:21:2
   |
21 | }
   |  ^ consider adding a `main` function to `$DIR/tests/trybuild/recursive_dependency.rs`