switch log crate to tracing

crates/proc_macro_api/Cargo.toml

@@ -11,7 +11,7 @@ doctest = false
 [dependencies]
 serde = { version = "1.0", features = ["derive"] }
 serde_json = { version = "1.0", features = ["unbounded_depth"] }
-log = "0.4.8"
+tracing = "0.1"
 crossbeam-channel = "0.5.0"
 jod-thread = "0.1.1"
 memmap2 = "0.3.0"

crates/proc_macro_api/src/msg.rs

@@ -93,7 +93,7 @@ fn read_json<'a>(
         // Some ill behaved macro try to use stdout for debugging
         // We ignore it here
         if !buf.starts_with('{') {
-            log::error!("proc-macro tried to print : {}", buf);
+            tracing::error!("proc-macro tried to print : {}", buf);
             continue;
         }
 
@@ -102,7 +102,7 @@ fn read_json<'a>(
 }
 
 fn write_json(out: &mut impl Write, msg: &str) -> io::Result<()> {
-    log::debug!("> {}", msg);
+    tracing::debug!("> {}", msg);
     out.write_all(msg.as_bytes())?;
     out.write_all(b"\n")?;
     out.flush()?;

crates/proc_macro_api/src/process.rs

@@ -54,7 +54,7 @@ impl ProcMacroProcessSrv {
             Ok(res) => res,
             Err(err) => {
                 let result = self.process.child.try_wait();
-                log::error!(
+                tracing::error!(
                     "proc macro server crashed, server process state: {:?}, server request error: {:?}",
                     result,
                     err