Bug Description

The Json support for postgresql only works through the usage of the Value type. The Json type when used as show in the documentation doesn't work : https://docs.rs/sqlx/latest/sqlx/types/struct.Json.html

I've checked the source and I have the feeling that the Json module is not covered by tests, it may have been broken in one refactoring.

Minimal Reproduction

I've made a minimal repo that repro the compiler error.

https://github.com/ElysaSrc/repro-sqlx-json-bug

Info

• SQLx version: 0.7.4
• SQLx features enabled: ["runtime-tokio","tls-rustls","postgres","chrono","migrate","uuid","json"]
• Database server and version: Postgres 14
• Operating system: Nixos unstable - Linux 6.7.9
• rustc --version: rustc 1.77.0 (aedd173a2 2024-03-17)