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-rw-r--r--tools/depot-scanner/main.go5
1 files changed, 5 insertions, 0 deletions
diff --git a/tools/depot-scanner/main.go b/tools/depot-scanner/main.go
index 4128fce187f0..9171587be2b9 100644
--- a/tools/depot-scanner/main.go
+++ b/tools/depot-scanner/main.go
@@ -94,6 +94,11 @@ func consumeOutput(stdout, stderr io.ReadCloser) (map[fileScanType]map[string]st
 		line := scanner.Text()
 		if strings.HasPrefix(line, depotTraceString) {
 			addPath(strings.TrimPrefix(line, depotTraceString), result)
+		} else {
+			// print remaining stderr output of nix-instantiate
+			// to prevent silent swallowing of possible important
+			// error messages (e.g. about command line interface changes)
+			fmt.Fprintf(os.Stderr, "nix-inst> %s\n", line)
 		}
 	}
 	if scanner.Err() != nil {