I am using cargo minimal-versions (which internally simply uses -Z minimal-versions and -Z direct-minimal-versions) to test if my library compiles when using the specified minimum versions for dependencies.

When I want to use educe this tool complains because the most recent version of educe (0.6.0) has as a dependency enum-ordinalize = "4.2" with the derive feature enabled, this means the minimum version of the derive crate enum-ordinalize-derive is 4.2.0 which depends on num-bigint = "0.4" whose minimum version 0.4.0 does not compile.

This is the error I get from the cargo minimal-versions tool:

error[E0308]: mismatched types
 --> /home/xxx/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/num-bigint-0.4.0/src/biguint/convert.rs:70:19
 |
70 | .div_ceil(&big_digit::BITS.into())
 | -------- ^^^^^^^^^^^^^^^^^^^^^^^ expected `u64`, found `&_`
 | |
 | arguments to this method are incorrect
 |
 = note: expected type `u64`
 found reference `&_`

Note that this broken dependency does not occur when using enum-ordinalize-derive = "4.2.1" or higher. I would therefore suggest to specify enum-ordinalize = "4.2.1" as minimum dependency in educe.