Fix tracing in the run_docker_compare.bash script.

scripts/run_docker_compare.bash

@@ -26,20 +26,24 @@ function build_container {
 function launch_container {
     local additional_flags=()
     local additional_args=()
+    local features=(compare)
 
     if [ "$NO_COLOR" != "" ]; then
         additional_flags+=(--env "NO_COLOR=$NO_COLOR")
     fi
 
-    if [ "$SHELL" != "YES" ]; then
-        additional_args+=(cargo run)
-    else
-        additional_flags+=(-t)
-    fi
-
     if [ "$TRACE" = "YES" ]; then
         # We use the host network so it can talk to jaeger hosted at 127.0.0.1
         additional_flags+=(--network=host --env RUST_LOG=debug)
+        features+=(tracing)
+    fi
+
+    if [ "$SHELL" != "YES" ]; then
+        local features_joined=$(IFS=","; echo "${features[*]}")
+        additional_args+=(cargo run --no-default-features --features "$features_joined")
+    else
+        additional_args+=(/bin/sh)
+        additional_flags+=(-t)
     fi
 
     if [ "$BACKTRACE" = "YES" ]; then