X-Git-Url: http://nitlanguage.org

diff --git a/lib/standard/string.nit b/lib/standard/string.nit
index d522714..fcc1f1b 100644
--- a/lib/standard/string.nit
+++ b/lib/standard/string.nit
@@ -611,6 +611,12 @@ abstract class String
 	redef type SELFTYPE: String
 
 	redef fun to_s do return self
+
+	fun append(s: String): SELFTYPE is abstract
+
+	fun prepend(s: String): SELFTYPE is abstract
+
+	fun insert_at(s: String, pos: Int): SELFTYPE is abstract
 end
 
 private class FlatSubstringsIter
@@ -635,8 +641,6 @@ class FlatString
 	super FlatText
 	super String
 
-	redef type SELFTYPE: FlatString
-
 	# Index in _items of the start of the string
 	private var index_from: Int