diff --git a/src/shell_interface.rs b/src/shell_interface.rs
index d16dd5b..8487f50 100644
--- a/src/shell_interface.rs
+++ b/src/shell_interface.rs
@@ -202,15 +202,20 @@ impl<T> CommandResult<T, StartError> {
   }
 }
 
-impl CommandResult<CommandOutput, ExecutionError<CommandOutput>> {
+impl<T> CommandResult<T, ExecutionError<T>> {
   pub fn into_result_with_error_logging(
     self,
     logger: &Logger,
-  ) -> Result<CommandOutput, CommandError<ExecutionError<CommandOutput>>> {
+  ) -> Result<T, CommandError<ExecutionError<T>>>
+  where
+    T: MaybeCast<CommandOutput>,
+  {
     self.result.map_err(|error| {
-      if let ExecutionError::BadExitStatus(output) = &error {
-        log!(logger, error, "{}", output.stdout.to_string_lossy());
-        log!(logger, error, "{}", output.stderr.to_string_lossy());
+      if let ExecutionError::BadExitStatus(t) = &error {
+        if let Some(output) = t.maybe_cast() {
+          log!(logger, error, "{}", output.stdout.to_string_lossy());
+          log!(logger, error, "{}", output.stderr.to_string_lossy());
+        }
       }
       CommandError {
         command: self.command,