Remove rustc-serialize dependency

Cargo.toml

@@ -36,13 +36,12 @@ rand = "0.6"
 rayon = "1"
 rls-analysis = "0.16.10"
 rls-blacklist = "0.1.3"
-rls-data = { version = "0.18.1", features = ["serialize-serde", "serialize-rustc"] }
+rls-data = { version = "0.18.1", features = ["serialize-serde"] }
 rls-rustc = "0.5.0"
 rls-span = { version = "0.4", features = ["serialize-serde"] }
 rls-vfs = "0.7"
 rustc_tools_util = "0.1.1"
 rustfmt-nightly = "1.0.1"
-rustc-serialize = "0.3"
 serde = "1.0"
 serde_json = "1.0"
 serde_derive = "1.0"

src/build/external.rs

@@ -37,6 +37,7 @@ use cargo::util::{process, ProcessBuilder};
 use log::trace;
 use rls_data::{Analysis, CompilationOptions};
 use serde_derive::Deserialize;
+use serde_json;
 
 fn cmd_line_to_command<S: AsRef<str>>(cmd_line: &S, cwd: &Path) -> Result<Command, ()> {
     let cmd_line = cmd_line.as_ref();
@@ -121,7 +122,7 @@ where
         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: Analysis = serde_json::from_str(&contents).map_err(|e| e.to_string())?;
         analyses.push(data);
     }