feat(build): Added tracing spans for rustc invocations

Author: ranger-ross

src/cargo/core/compiler/mod.rs

@@ -67,7 +67,7 @@ use std::sync::Arc;
 
 use anyhow::{Context as _, Error};
 use lazycell::LazyCell;
-use tracing::{debug, trace};
+use tracing::{debug, instrument, trace};
 
 pub use self::build_config::{BuildConfig, CompileMode, MessageFormat, TimingOutput};
 pub use self::build_context::{
@@ -140,10 +140,11 @@ pub trait Executor: Send + Sync + 'static {
 pub struct DefaultExecutor;
 
 impl Executor for DefaultExecutor {
+    #[instrument(name = "rustc", skip_all, fields(package = id.name().as_str(), process = cmd.to_string()))]
     fn exec(
         &self,
         cmd: &ProcessBuilder,
-        _id: PackageId,
+        id: PackageId,
         _target: &Target,
         _mode: CompileMode,
         on_stdout_line: &mut dyn FnMut(&str) -> CargoResult<()>,