nitc&lib: MapIterator keys can be nullable

[nit.git] / lib / standard / string.nit

diff --git a/lib/standard/string.nit b/lib/standard/string.nit
index c4ae7b0..f1d3288 100644 (file)
--- a/lib/standard/string.nit
+++ b/lib/standard/string.nit
@@ -2174,7 +2174,7 @@ redef class Map[K,V]
                var i = iterator
                var k = i.key
                var e = i.item
-               s.append("{k}{couple_sep}{e or else "<null>"}")
+               s.append("{k or else "<null>"}{couple_sep}{e or else "<null>"}")
 
                # Concat other items
                i.next
@@ -2182,7 +2182,7 @@ redef class Map[K,V]
                        s.append(sep)
                        k = i.key
                        e = i.item
-                       s.append("{k}{couple_sep}{e or else "<null>"}")
+                       s.append("{k or else "<null>"}{couple_sep}{e or else "<null>"}")
                        i.next
                end
                return s.to_s