Bump MSRV to 1.85 and switch to the 2024 edition (#3126)

Running `cargo fix --edition` produces a lot of noise, and the relative
drop order change shouldn't affect us because we don't use any unsafe
code. What I did was manually change the edition and then just fix the
compiler errors.

Author: mkrasnitski

.github/workflows/ci.yml

@@ -3,8 +3,8 @@ name: CI
 on: [push, pull_request]
 
 env:
-  rust_min: 1.82.0
-  rust_nightly: nightly-2024-11-01
+  rust_min: 1.85.0
+  rust_nightly: nightly-2025-02-19
 
 jobs:
   test:

Cargo.toml

@@ -23,8 +23,8 @@ homepage = "https://github.com/serenity-rs/serenity"
 repository = "https://github.com/serenity-rs/serenity.git"
 keywords = ["discord", "api"]
 license = "ISC"
-edition = "2021"
-rust-version = "1.82"
+edition = "2024"
+rust-version = "1.85"
 
 [dependencies]
 # Required dependencies

README.md

@@ -100,7 +100,7 @@ tokio = { version = "1.21.2", features = ["macros", "rt-multi-thread"] }
 
 ## MSRV Policy
 
-Serenity's minimum supported Rust version (MSRV) is Rust 1.82.
+Serenity's minimum supported Rust version (MSRV) is Rust 1.85.
 
 We opt to keep MSRV stable on the `current` branch. This means it will remain
 unchanged between minor releases. Occasionally, dependencies may violate SemVer
@@ -244,5 +244,5 @@ a Rust-native cloud development platform that allows deploying Serenity bots for
 [repo:andesite]: https://github.com/natanbc/andesite
 [repo:lavaplayer]: https://github.com/sedmelluq/lavaplayer
 [logo]: https://raw.githubusercontent.com/serenity-rs/serenity/current/logo.png
-[rust-version-badge]: https://img.shields.io/badge/rust-1.82.0+-93450a.svg?style=flat-square
-[rust-version-link]: https://blog.rust-lang.org/2024/10/17/Rust-1.82.0.html
+[rust-version-badge]: https://img.shields.io/badge/rust-1.85.0+-93450a.svg?style=flat-square
+[rust-version-link]: https://blog.rust-lang.org/2025/02/20/Rust-1.85.0.html

examples/e01_basic_ping_bot/Cargo.toml

@@ -2,7 +2,7 @@
 name = "e01_basic_ping_bot"
 version = "0.1.0"
 authors = ["my name <[email protected]>"]
-edition = "2018"
+edition.workspace = true
 
 [dependencies]
 serenity = { path = "../../", default-features = false, features = ["gateway", "model", "rustls_backend"] }

examples/e02_transparent_guild_sharding/Cargo.toml

@@ -2,7 +2,7 @@
 name = "e02_transparent_guild_sharding"
 version = "0.1.0"
 authors = ["my name <[email protected]>"]
-edition = "2018"
+edition.workspace = true
 
 [dependencies]
 serenity = { path = "../../", default-features = false, features = ["gateway", "model", "rustls_backend"] }

examples/e03_struct_utilities/Cargo.toml

@@ -2,7 +2,7 @@
 name = "e03_struct_utilities"
 version = "0.1.0"
 authors = ["my name <[email protected]>"]
-edition = "2018"
+edition.workspace = true
 
 [dependencies]
 serenity = { path = "../../", default-features = false, features = ["gateway", "model", "rustls_backend"] }

examples/e04_message_builder/Cargo.toml

@@ -2,7 +2,7 @@
 name = "e04_message_builder"
 version = "0.1.0"
 authors = ["my name <[email protected]>"]
-edition = "2018"
+edition.workspace = true
 
 [dependencies]
 serenity = { path = "../../", default-features = false, features = ["gateway", "model", "rustls_backend"] }

examples/e05_sample_bot_structure/Cargo.toml

@@ -2,7 +2,7 @@
 name = "e05_sample_bot_structure"
 version = "0.1.0"
 authors = ["my name <[email protected]>"]
-edition = "2021"
+edition.workspace = true
 
 [dependencies]
 serenity = { path = "../../", default-features = false, features = ["collector", "rustls_backend"] }

examples/e06_env_logging/Cargo.toml

@@ -2,7 +2,7 @@
 name = "e06_env_logging"
 version = "0.1.0"
 authors = ["my name <[email protected]>"]
-edition = "2018"
+edition.workspace = true
 
 [dependencies]
 tracing = "0.1.23"

examples/e07_shard_manager/Cargo.toml

@@ -2,7 +2,7 @@
 name = "e07_shard_manager"
 version = "0.1.0"
 authors = ["my name <[email protected]>"]
-edition = "2018"
+edition.workspace = true
 
 [dependencies]
 tokio = { version = "1.0", features = ["macros", "rt-multi-thread", "time"] }