D Map Treemap viewer

[Andrej Mitrovic]

This is awesome and I was just about to request for something like
this too. Great job!

What is not awesome is that DMD spits out map files with invalid code points. :(

DMapTreeMap>rdmd treemapgen.d test13_2056.map out.json
std.utf.UTFException at std\utf.d(637): Invalid UTF-8 sequence (at index 15342)

I've checked it with an editor and there are tons of invalid code
points in the map file.