https://issues.dlang.org/show_bug.cgi?id=16983
b2.t...@gmx.com changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |INVALID --- Comment #1 from b2.t...@gmx.com --- You must import the module where the example stands and it works. This is true for any example in phobos, so here just add import `import std.range;` --