HashMap ++ bug
Minimal example:
var map = new HashMap<string,int>();
map["word"] = map["word"] + 1; //works
map["word"] += 1; //works
map["word"]++; // The expression `Gee.HashMap<string,int>' does not denote an array
//Expression of integer type expected
PS Its Gee, also there no way to use [] operator for GLib HashTable.