Use serde_json for json error messages

compiler/rustc_errors/src/json.rs

@@ -28,7 +28,7 @@ use std::path::Path;
 use std::sync::{Arc, Mutex};
 use std::vec;
 
-use rustc_serialize::json::{as_json, as_pretty_json};
+use serde::Serialize;
 
 #[cfg(test)]
 mod tests;
@@ -126,9 +126,9 @@ impl Emitter for JsonEmitter {
     fn emit_diagnostic(&mut self, diag: &crate::Diagnostic) {
         let data = Diagnostic::from_errors_diagnostic(diag, self);
         let result = if self.pretty {
-            writeln!(&mut self.dst, "{}", as_pretty_json(&data))
+            writeln!(&mut self.dst, "{}", serde_json::to_string_pretty(&data).unwrap())
         } else {
-            writeln!(&mut self.dst, "{}", as_json(&data))
+            writeln!(&mut self.dst, "{}", serde_json::to_string(&data).unwrap())
         }
         .and_then(|_| self.dst.flush());
         if let Err(e) = result {
@@ -139,9 +139,9 @@ impl Emitter for JsonEmitter {
     fn emit_artifact_notification(&mut self, path: &Path, artifact_type: &str) {
         let data = ArtifactNotification { artifact: path, emit: artifact_type };
         let result = if self.pretty {
-            writeln!(&mut self.dst, "{}", as_pretty_json(&data))
+            writeln!(&mut self.dst, "{}", serde_json::to_string_pretty(&data).unwrap())
         } else {
-            writeln!(&mut self.dst, "{}", as_json(&data))
+            writeln!(&mut self.dst, "{}", serde_json::to_string(&data).unwrap())
         }
         .and_then(|_| self.dst.flush());
         if let Err(e) = result {
@@ -161,9 +161,9 @@ impl Emitter for JsonEmitter {
             .collect();
         let report = FutureIncompatReport { future_incompat_report: data };
         let result = if self.pretty {
-            writeln!(&mut self.dst, "{}", as_pretty_json(&report))
+            writeln!(&mut self.dst, "{}", serde_json::to_string_pretty(&report).unwrap())
         } else {
-            writeln!(&mut self.dst, "{}", as_json(&report))
+            writeln!(&mut self.dst, "{}", serde_json::to_string(&report).unwrap())
         }
         .and_then(|_| self.dst.flush());
         if let Err(e) = result {
@@ -175,9 +175,9 @@ impl Emitter for JsonEmitter {
         let lint_level = lint_level.as_str();
         let data = UnusedExterns { lint_level, unused_extern_names: unused_externs };
         let result = if self.pretty {
-            writeln!(&mut self.dst, "{}", as_pretty_json(&data))
+            writeln!(&mut self.dst, "{}", serde_json::to_string_pretty(&data).unwrap())
         } else {
-            writeln!(&mut self.dst, "{}", as_json(&data))
+            writeln!(&mut self.dst, "{}", serde_json::to_string(&data).unwrap())
         }
         .and_then(|_| self.dst.flush());
         if let Err(e) = result {
@@ -204,7 +204,7 @@ impl Emitter for JsonEmitter {
 
 // The following data types are provided just for serialisation.
 
-#[derive(Encodable)]
+#[derive(Serialize)]
 struct Diagnostic {
     /// The primary error message.
     message: String,
@@ -218,7 +218,7 @@ struct Diagnostic {
     rendered: Option<String>,
 }
 
-#[derive(Encodable)]
+#[derive(Serialize)]
 struct DiagnosticSpan {
     file_name: String,
     byte_start: u32,
@@ -245,7 +245,7 @@ struct DiagnosticSpan {
     expansion: Option<Box<DiagnosticSpanMacroExpansion>>,
 }
 
-#[derive(Encodable)]
+#[derive(Serialize)]
 struct DiagnosticSpanLine {
     text: String,
 
@@ -255,7 +255,7 @@ struct DiagnosticSpanLine {
     highlight_end: usize,
 }
 
-#[derive(Encodable)]
+#[derive(Serialize)]
 struct DiagnosticSpanMacroExpansion {
     /// span where macro was applied to generate this code; note that
     /// this may itself derive from a macro (if
@@ -269,7 +269,7 @@ struct DiagnosticSpanMacroExpansion {
     def_site_span: DiagnosticSpan,
 }
 
-#[derive(Encodable)]
+#[derive(Serialize)]
 struct DiagnosticCode {
     /// The code itself.
     code: String,
@@ -277,7 +277,7 @@ struct DiagnosticCode {
     explanation: Option<&'static str>,
 }
 
-#[derive(Encodable)]
+#[derive(Serialize)]
 struct ArtifactNotification<'a> {
     /// The path of the artifact.
     artifact: &'a Path,
@@ -285,12 +285,12 @@ struct ArtifactNotification<'a> {
     emit: &'a str,
 }
 
-#[derive(Encodable)]
+#[derive(Serialize)]
 struct FutureBreakageItem {
     diagnostic: Diagnostic,
 }
 
-#[derive(Encodable)]
+#[derive(Serialize)]
 struct FutureIncompatReport {
     future_incompat_report: Vec<FutureBreakageItem>,
 }
@@ -299,7 +299,7 @@ struct FutureIncompatReport {
 // doctest component (as well as cargo).
 // We could unify this struct the one in rustdoc but they have different
 // ownership semantics, so doing so would create wasteful allocations.
-#[derive(Encodable)]
+#[derive(Serialize)]
 struct UnusedExterns<'a, 'b, 'c> {
     /// The severity level of the unused dependencies lint
     lint_level: &'a str,