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-rw-r--r--guix/build/union.scm2
1 files changed, 1 insertions, 1 deletions
diff --git a/guix/build/union.scm b/guix/build/union.scm
index 256123c566..d46b750035 100644
--- a/guix/build/union.scm
+++ b/guix/build/union.scm
@@ -93,7 +93,7 @@ make sure the caller can modify them later."
(cond ((null? dirs)
;; The inputs are all files.
(format (current-error-port)
- "warning: collision encountered: ~{~a ~}~%"
+ "~%warning: collision encountered:~%~{~a~%~}"
files)
(let ((file (first files)))