OK, I think I found the change in our examples: $ grep updateRow ~/gintro/examples/gtk3/* /home/salewski/gintro/examples/gtk3/css_colored_listview.nim:proc updateRow(renderer: CellRendererText; path: string; newText: string; tree: TreeView) = /home/salewski/gintro/examples/gtk3/css_colored_listview.nim: connect(renderer2, "edited", updateRow, tree) Run
Above string parameter type is used. But in our luckily still not updated readme we still use cstring: [http://ssalewski.de/gintroreadme.html#_a_simple_listview_example](http://ssalewski.de/gintroreadme.html#_a_simple_listview_example) proc updateRow(renderer: CellRendererText; path: cstring; newText: cstring; tree: TreeView) = Run