remove unused serde feature from smol_str

Author: matklad

Cargo.lock

@@ -18,8 +18,7 @@ rustc-hash = "1.1.0"
 arrayvec = "0.7"
 once_cell = "1.3.1"
 indexmap = "1.4.0"
-smol_str = { version = "0.1.15", features = ["serde"] }
-serde = { version = "1.0.106", features = ["derive"] }
+smol_str = "0.1.15"
 
 stdx = { path = "../stdx", version = "0.0.0" }
 text_edit = { path = "../text_edit", version = "0.0.0" }

crates/syntax/Cargo.toml

@@ -9,8 +9,6 @@ edition = "2018"
 doctest = false
 
 [dependencies]
-# ideally, `serde` should be enabled by `rust-analyzer`, but we enable it here
-# to reduce number of compilations
-smol_str = { version = "0.1.15", features = ["serde"] }
+smol_str = "0.1"
 
 stdx = { path = "../stdx", version = "0.0.0" }