Running clippy again found two more improvements.

Missed a manual memcpy loop in engine-object-file.

CompilerType::enabled() is a Vec<>, so just use is_empty() instead of trying to generically determine whether an Iter is empty.

lib/cli/src/commands/run.rs

@@ -80,7 +80,7 @@ impl Run {
             format!(
                 "failed to run `{}`{}",
                 self.path.display(),
-                if CompilerType::enabled().iter().next().is_none() {
+                if CompilerType::enabled().is_empty() {
                     " (no compilers enabled)"
                 } else {
                     ""