Adding array of char?

What does the following program do? program test; type Str255 = array[0..255] of char; var a,b: Str255; begin a := a + b; end. I would have expected it to error, but it compilers fine. Is this some sort of support for strings, cstrings or something? I tried looking at the resulting .s file, but it produced quite a few lines of assembly code and I've never been good at reading PowerPC assembly. It had several memcpy calls in it. Thanks, Peter. -- <http://www.interarchy.com/> <http://download.interarchy.com/>