fix: Enable clippy::arithmetic_side_effects lint

Cargo.toml

@@ -24,5 +24,8 @@ homepage = "https://sentry.io/welcome/"
 edition = "2021"
 rust-version = "1.88"
 
+[workspace.lints.clippy]
+arithmetic-side-effects.level = "warn"
+
 [workspace.lints.rust]
 unexpected_cfgs = { level = "warn", check-cfg = ['cfg(doc_cfg)'] }

sentry-contexts/src/utils.rs

@@ -54,7 +54,7 @@ mod model_support {
 
     pub fn get_macos_version() -> Option<String> {
         let version = sysctlbyname_call("kern.osproductversion")?;
-        let dot_count = version.split('.').count() - 1;
+        let dot_count = version.split('.').count().saturating_sub(1);
         if dot_count < 2 {
             return Some(version + ".0");
         }

sentry-core/src/logger.rs

@@ -25,13 +25,13 @@ macro_rules! logger_log {
             "sentry.message.template".to_owned(),
             $crate::protocol::LogAttribute($crate::protocol::Value::from($fmt))
         );
-        let mut i = 0;
+        let mut i = 0usize;
         $(
             attributes.insert(
                 format!("sentry.message.parameter.{}", i),
                 $crate::protocol::LogAttribute($crate::protocol::Value::from($arg))
             );
-            i += 1;
+            i = i.checked_add(1).expect("number of parametrs should not overflow usize");
         )*
         let _ = i; // avoid triggering the `unused_assignments` lint
 

sentry-core/src/session.rs

@@ -2,6 +2,8 @@
 //!
 //! <https://develop.sentry.dev/sdk/sessions/>
 
+#![expect(clippy::arithmetic_side_effects)] // https://github.com/getsentry/sentry-rust/issues/1117
+
 #[cfg(feature = "release-health")]
 pub use session_impl::*;
 

sentry-types/src/protocol/envelope.rs

@@ -1,3 +1,5 @@
+#![expect(clippy::arithmetic_side_effects)] // https://github.com/getsentry/sentry-rust/issues/1118
+
 use std::{borrow::Cow, io::Write, path::Path, time::SystemTime};
 
 use serde::{Deserialize, Serialize};

sentry/src/transports/ratelimit.rs

@@ -1,3 +1,5 @@
+#![expect(clippy::arithmetic_side_effects)] // https://github.com/getsentry/sentry-rust/issues/1115
+
 use httpdate::parse_http_date;
 use std::time::{Duration, SystemTime};