If you remove the .metadata directory in the workspace it works. You will have to reread/import your projects and then next time you start the IDE the problem is back. So not really a fix but more an annoying workaround. 

The issue is still in 1.16.0 and also in 1.16.1

But don't add a semicolon in the end! Shall be:__attribute__ ((section(".RamFunc"))) void some_function() {}

Could you explain how you solved the problem ? I guess there are a few here who dont read chinese.