System errors could be more verbose

[layus]

For example, when fopen fails to find the file to open it could report the filename together with the "File not found" message.
Just an idea...

[eregon]

This seems implemented in Mozart 1 by showing the calling statement, including its arguments:

%*********************** error in OS module *********************
%**
%** Operating system error
%**
%** System call:  chdir
%** Error number: 2
%** Description:  No such file or directory
%** In statement: {<P/1 OS.chDir> [110 111 116 69 120 105 115 116]}
%**
%** Call Stack:
%** procedure in file "./testSystem.oz", line 1, column 0, PC = 10639132
%**--------------------------------------------------------------

But having the UTF8 representation of the path would probably be a lot more useful.