src: Improve speed of interpreter when working with Strings

[nit.git] / lib / core / text / native.nit

diff --git a/lib/core/text/native.nit b/lib/core/text/native.nit
index 1c9e262..051cefb 100644 (file)
--- a/lib/core/text/native.nit
+++ b/lib/core/text/native.nit
@@ -253,7 +253,7 @@ extern class NativeString `{ char* `}
        end
 
        # Number of UTF-8 characters in `self` starting at `from`, for a length of `bytelen`
-       fun utf8_length(from, bytelen: Int): Int do
+       fun utf8_length(from, bytelen: Int): Int is intern do
                var st = from
                var ln = 0
                while bytelen > 0 do