Colcon Tutorial on Dashing does not build

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Ubuntu 18.04 running Dashing on hash bafddbdb of master

The example from the Colcon Tutorial does not build.

https://index.ros.org/doc/ros2/Tutori...

I kept getting errors like this from colcon :

Could not find a package configuration file provided by "example_interfaces" with any of the following names:

example_interfacesConfig.cmake
example_interfaces-config.cmake_

I grepped through the commit logs of this repo and 64128033 seemed like the cause - so I cloned https://github.com/ros2/example_inter... into my src directory such that my filesystem was like this

---- src

-------- examples

-------- example_interfaces

and Cmake stopped complaining about an unknown dependency.

After that I got a build error on master, went to the dashing branch and got farther, but I kept getting more colcon errors, and after cloning the following three repos into my src directory colcon built for me

https://github.com/ros2/rclcpp https://github.com/ros2/rcl_interfaces https://github.com/ros2/test_interfac...

my final directory structure looked like this: .

---- src

-------- examples

-------- example_interfaces

-------- rcl_interfaces

-------- test_interface_files

Did I miss a step in my install or is that tutorial lacking these steps?

Thanks