comment on BuildFail misuse

Author: Skgland

src/runner/worker.rs

@@ -246,6 +246,7 @@ impl<'a> Worker<'a> {
                 } else {
                     match failure_reason(&err) {
                         crate::results::FailureReason::Unknown => TestResult::Error,
+                        // BuildFail should have the desired semantics even if a seperate PrepareFail variant would be cleaner
                         reason => TestResult::BuildFail(reason),
                     }
                 };