core: fix warnings in ropes

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>

diff --git a/lib/core/text/ropes.nit b/lib/core/text/ropes.nit
index 0bf97b8..f57b33d 100644 (file)
--- a/lib/core/text/ropes.nit
+++ b/lib/core/text/ropes.nit
@@ -821,7 +821,7 @@ private class ReverseRopeSubstrings
        redef fun next do
                if pos < 0 then return
                var curr = iter.prev
-               var currit = curr.node
+               var currit = curr.as(not null).node
                while curr != null do
                        currit = curr.node
                        if not currit isa Concat then
@@ -928,14 +928,14 @@ private class RopeSubstrings
        redef fun next do
                pos += str.length
                if pos > max then return
-               var it = iter.prev
+               var it = iter.prev.as(not null)
                var rnod = it.node
                loop
                        if not rnod isa Concat then
                                it.ldone = true
                                it.rdone = true
                                str = rnod.as(FlatString)
-                               iter = it.as(not null)
+                               iter = it
                                break
                        end
                        if not it.ldone then
@@ -947,7 +947,7 @@ private class RopeSubstrings
                                rnod = rnod._right
                                it = new RopeCharIteratorPiece(rnod, false, false, it)
                        else
-                               it = it.prev
+                               it = it.prev.as(not null)
                                rnod = it.node
                                continue
                        end