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-rw-r--r--src/libexpr/nixexpr.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libexpr/nixexpr.cc b/src/libexpr/nixexpr.cc
index b916a26d2169..bb72c007cbcd 100644
--- a/src/libexpr/nixexpr.cc
+++ b/src/libexpr/nixexpr.cc
@@ -143,7 +143,7 @@ std::ostream & operator << (std::ostream & str, const Pos & pos)
     if (!pos)
         str << "undefined position";
     else
-        str << (format("%1%:%2%:%3%") % pos.file % pos.line % pos.column).str();
+        str << (format(ANSI_BOLD "%1%" ANSI_NORMAL ":%2%:%3%") % pos.file % pos.line % pos.column).str();
     return str;
 }