internal: Split serde derive feature into `serde_derive` usage

Ideally we'd not have any dependency pull in the derive feature for faster build times, once that is the case this change would have an actual effect.
See https://github.com/matklad/macro-dep-test/blob/master/README.md for context.

3 files changed, 3 insertions, 2 deletions

diff --git a/src/tools/rust-analyzer/crates/project-model/Cargo.toml b/src/tools/rust-analyzer/crates/project-model/Cargo.toml
index 68e0e1ba554..ed647950e66 100644
--- a/src/tools/rust-analyzer/crates/project-model/Cargo.toml
+++ b/src/tools/rust-analyzer/crates/project-model/Cargo.toml
@@ -19,6 +19,7 @@ rustc-hash.workspace = true
 semver.workspace = true
 serde_json.workspace = true
 serde.workspace = true
+serde_derive.workspace = true
 tracing.workspace = true
 triomphe.workspace = true
 la-arena.workspace = true
diff --git a/src/tools/rust-analyzer/crates/project-model/src/build_dependencies.rs b/src/tools/rust-analyzer/crates/project-model/src/build_dependencies.rs
index dc71b13eeec..524323b9736 100644
--- a/src/tools/rust-analyzer/crates/project-model/src/build_dependencies.rs
+++ b/src/tools/rust-analyzer/crates/project-model/src/build_dependencies.rs
@@ -15,7 +15,7 @@ use itertools::Itertools;
 use la_arena::ArenaMap;
 use paths::{AbsPath, AbsPathBuf, Utf8PathBuf};
 use rustc_hash::{FxHashMap, FxHashSet};
-use serde::Deserialize;
+use serde::Deserialize as _;
 use toolchain::Tool;
 
 use crate::{
diff --git a/src/tools/rust-analyzer/crates/project-model/src/cargo_workspace.rs b/src/tools/rust-analyzer/crates/project-model/src/cargo_workspace.rs
index 4ae3426ed97..ba4946bf0b9 100644
--- a/src/tools/rust-analyzer/crates/project-model/src/cargo_workspace.rs
+++ b/src/tools/rust-analyzer/crates/project-model/src/cargo_workspace.rs
@@ -8,7 +8,7 @@ use cargo_metadata::{CargoOpt, MetadataCommand};
 use la_arena::{Arena, Idx};
 use paths::{AbsPath, AbsPathBuf, Utf8PathBuf};
 use rustc_hash::{FxHashMap, FxHashSet};
-use serde::Deserialize;
+use serde_derive::Deserialize;
 use serde_json::from_value;
 use span::Edition;
 use toolchain::Tool;