Fails on `find_subimage` repository

[vi]

When I try it on https://github.com/nico-abram/find-subimage (commit 8943d020a468f17b7ac8a57111263808aaccd6b3), that has old image and opencv dependencies, cargo-outdated fails:

$ cargo outdated --depth=1
error: failed to select a version for `opencv`.
    ... required by package `find-subimage v0.1.12 (/tmp/cargo-outdated3hT2Co)`
versions that meet the requirements `^0.97.2` are: 0.97.2

the package `find-subimage` depends on `opencv`, with features: `docs-only` but `opencv` does not have these features.


failed to select a version for `opencv` which could resolve this conflict

Even if cargo-oudated cannot determine the good compatible version, I still expect it to output at least a partial report.

[zheland]

I believe this issue is caused when a local feature enables a dependency feature that is removed in a newer version.

So I suggest renaming issue title to something like:

Failed to select a dependency version when a local feature enables a dependency feature that is removed in a newer version

Examples

Here's a minimal reproducible examples.

This works fine:

[package]
name = "test-bin"
version = "0.1.0"
edition = "2021"

[dependencies]
rand = { version = "0.8.5", features = [ "getrandom" ] }

cargo outdated --exit-code 1; echo $?

warning: Feature getrandom of package rand has been obsolete in version 0.9.2
Name                    Project                        Compat  Latest   Kind    Platform
----                    -------                        ------  ------   ----    --------
rand                    0.8.5                          ---     0.9.2    Normal  ---
1

This reproduces the issue:

[package]
name = "test-bin"
version = "0.1.0"
edition = "2021"

[features]
getrandom = [ "rand/getrandom" ]

[dependencies]
rand = { version = "0.8.5" }

cargo outdated --exit-code 1; echo $?

error: failed to select a version for `rand`.
    ... required by package `test-bin v0.1.0 (/tmp/cargo-outdatedMPXXkF)`
versions that meet the requirements `^0.9.2` are: 0.9.2

the package `test-bin` depends on `rand`, with features: `getrandom` but `rand` does not have these features.

failed to select a version for `rand` which could resolve this conflict
1

Description

In crate rand@0.8.5 there was a getrandom feature.
But in the crate version rand@0.9.2 there is no longer getrandom feature.

Similarly in crate opencv@0.61.3 there was a docs-only feature.
But, in the new crate version opencv@0.98.1 there is no longer docs-only feature.
And https://github.com/nico-abram/find-subimage similarly conditionally enables opencv/docs-only feature.

What happens is that cargo-outdated tries to check for updates of rand/opencv and enables the local feature getrandom/docs-only, which in turn tries to enable the feature getrandom/docs-only of newer rand/opencv.
However, in rand version 0.9.2 / opencv version 0.98.1, the getrandom/docs-only feature has been removed (or renamed).
So, when cargo-outdated tries to compile with rand = { version = "0.9.2", features = [ "getrandom" ] } or opencv = { version = "0.98.1", features = [ "docs-only" ] }, and it fails.

Workaround

If it is expected that some dependency should not be updated, --exclude DEPENDENCY_NAME can be used as a workaround.

For both toml variants from examples:

cargo outdated --exclude rand --exit-code 1; echo $?

All dependencies are up to date, yay!
0

[Aunmag]

Same problem with

schemars = { version = "0.8", features = ["url", "uuid1"] }

Got error:

the package `my-project` depends on `schemars`, with features: `url` but `schemars` does not have these features.

As @zheland suggested, the only workaround is to exclude problematic dependency with cargo outdated --exclude DEPENDENCY_NAME

See related issues: #301, #427, #84