id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
5712	The old frontend allows duplicate variables in protected sections input sections and output sections	johti17@…	John Tinnerholm	"{{{#!mo
function fz
  input Integer I;
  input Integer I;
end fz;

function fy
protected
  Integer I;
  Integer I;
end fy;

function fx
  input Integer I;
  input Integer I;
protected
  Integer X;
  Integer X;
end fx;
}}}
Duplicate variables in protected section compiles, they are simply replaced in the backend. However, this allows modellers to write duplicate declarations in MetaModelica, and in Modelica. 

It seems we allow it since the specification says that duplication is allowed during inheritance. 
"	defect	closed	low	Future	Frontend	v1.16.0-dev	wontfix	Semantics, MetaModelica,Modelica