add tests for dup parameter names including ::T
add tests for dup parameter names including ::T

bitrauser/roast,dankogai/roast,zostay/roast,skids/roast,laben/roast,zostay/roast,perl6/roast,cygx/roast,bitrauser/roast,niner/roast,cygx/roast,b2gills/roast,niner/roast,skids/roast,niner/roast,dogbert17/roast,b2gills/roast,dankogai/roast,laben/roast,b2gills/roast,zostay/roast,skids/roast,laben/roast,dankogai/roast,cygx/roast,dogbert17/roast