clean: make some classes abstract or interfaces

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

diff --git a/lib/standard/string.nit b/lib/standard/string.nit
index 6089102..08921f7 100644 (file)
--- a/lib/standard/string.nit
+++ b/lib/standard/string.nit
@@ -605,7 +605,7 @@ class NativeString
 end
 
 # StringCapable objects can create native strings
-class StringCapable
+interface StringCapable
        protected fun calloc_string(size: Int): NativeString is intern
 end