Use serde instead of rustc_serialize

Cargo.toml

@@ -21,9 +21,9 @@ test = false
 path = "rls/src/main.rs"
 
 [dependencies]
-rls-analysis = "0.16.12"
+rls-analysis = { version = "0.16.13", features = ["serialize-serde"], default-features = false }
 rls-blacklist = "0.1.3"
-rls-data = { version = "0.18.2", features = ["serialize-serde", "serialize-rustc"] }
+rls-data = { version = "0.18.2", features = ["serialize-serde"] }
 # FIXME: Release rls-rustc 0.6.0 to crates.io
 rls-rustc = { version = "0.6.0", path = "rls-rustc" }
 rls-span = { version = "0.4", features = ["serialize-serde"] }

rls/src/build/external.rs

@@ -106,7 +106,7 @@ where
         let mut contents = String::new();
         file.read_to_string(&mut contents).map_err(|e| e.to_string())?;
 
-        let data = rustc_serialize::json::decode(&contents).map_err(|e| e.to_string())?;
+        let data = serde_json::from_str(&contents).map_err(|e| e.to_string())?;
         analyses.push(data);
     }