fix(complete): Flush completion traces

Author: epage

src/bin/cargo/main.rs

@@ -31,9 +31,19 @@ fn main() {
 
     let nightly_features_allowed = matches!(&*features::channel(), "nightly" | "dev");
     if nightly_features_allowed {
+        let args = std::env::args_os();
+        let current_dir = std::env::current_dir().ok();
         let completer =
             clap_complete::CompleteEnv::with_factory(|| cli::cli(&mut gctx)).var("CARGO_COMPLETE");
-        completer.complete();
+        if completer
+            .try_complete(args, current_dir.as_deref())
+            .unwrap_or_else(|e| {
+                let mut shell = Shell::new();
+                cargo::exit_with_error(e.into(), &mut shell)
+            })
+        {
+            return;
+        }
     }
 
     let result = if let Some(lock_addr) = cargo::ops::fix_get_proxy_lock_addr() {