src/doc: introduce DocComposite HTML rendering services

[nit.git] / lib / ai / backtrack.nit

diff --git a/lib/ai/backtrack.nit b/lib/ai/backtrack.nit
index 0232b4c..ddc68ef 100644 (file)
--- a/lib/ai/backtrack.nit
+++ b/lib/ai/backtrack.nit
@@ -86,7 +86,7 @@ end
 # 2. Apply the method `run`, that will search and return a solution.
 # 3. Retrieve information from the solution.
 #
-# ~~~~
+# ~~~~nitish
 # var p: BacktrackProblem = new MyProblem
 # var solver = p.solve
 # var res = solver.run
@@ -209,6 +209,7 @@ class BacktrackSolver[S: Object, A]
 
                                problem.backtrack(state, a)
                                node = node.parent
+                               assert node != null
                                continue
                        end