Build failed with `default-features = false`

[50U10FCA7]

Describe the bug
Juniper failed to build if specified as dependency with default-features = false

Build result:

error[E0433]: failed to resolve: could not find `ContentRefDeserializer` in `de`
   --> ~/juniper/juniper/src/http/mod.rs:232:17
    |
232 | #[derive(Debug, Deserialize, PartialEq)]
    |                 ^^^^^^^^^^^ could not find `ContentRefDeserializer` in `de`
    |
    = note: this error originates in the derive macro `Deserialize` (in Nightly builds, run with -Z macro-backtrace for more info)

To Reproduce
Steps to reproduce the behavior:

• create a new (empty) rust project
• set juniper as dependency with default-features = false
• execute cargo run in project directory

Expected behavior
Build successful.

Additional context
The cause of the problem is that juniper specifies serde as dependency with no std feature enabled. The serde/std feature implements serialize/deserialize for std's structs like Vec, HashMap, etc... But juniper uses Serialize on a struct which field is a Vec.

At now, juniper can build with default-features = true only because bson dependency uses serde/std feature.

[tyranron]

@50U10FCA7 I wonder why the cargo check -p juniper --no-default-features running on CI doesn't reproduce this? 😕

[tyranron]

Is it because of Cargo workspace? 🤔

[50U10FCA7]

@tyranron

Is it because of Cargo workspace? 🤔

Probably one of the workspace dependencies enables serde/std feature, but not sure. Check still pass if remove serde/std feature from all workspace-member crates, but I think the situation is the same when bson dependency hide this error (Compiles because dependency of dependency enables the feature).