lib: Pattern is an interface

Signed-off-by: Jean Privat <jean@pryen.org>

diff --git a/lib/standard/string_search.nit b/lib/standard/string_search.nit
index d37ac7b..162beec 100644 (file)
--- a/lib/standard/string_search.nit
+++ b/lib/standard/string_search.nit
@@ -17,7 +17,7 @@ package string_search
 import string
 
 # Patterns are string motifs.
-class Pattern
+interface Pattern
        # Search `self' into `s' from a certain position.
        # Return the position of the first character of the matching section.
        # Return -1 if not found.