http://www.digitalmars.com/d/phobos/std_gc.html says "it will throw an OutOfMemory exception" for enable/disable, which should be OutOfMemoryException, and there's no mention of where to find this. std.outofmemory appears to be completely undocumented.
http://www.digitalmars.com/d/phobos/std_path.html says "Throws: std.OutOfMemory if there is not enough memory" for expandTilde(), which is very wrong, and probably doesn't even need to be mentioned; any function that allocates memory can throw it.
I think OutOfMemoryException should be defined in std.gc and std.outofmemory should have a deprecated alias.