no slot of name "file" for this object of class "RasterStack"

[achubaty]

I'm hitting an issue reported in a comment on a related but closed issue:

          This example also doesn't work in the current stable and devel versions (it worked fine before):

library("raster")
r = stack(system.file("external/rlogo.grd", package = "raster"))
r = readAll(r)
tmp = tempfile(fileext = ".tif")
writeRaster(r, tmp)
#> Error in .startGDALwriting(x, filename, gdal = options, ...) : 
#>   no slot of name "file" for this object of class "RasterStack"

Originally posted by @kadyb in #307 (comment)

[rhijmans]

Thanks, fixed now. Sorry for the long wait.

[achubaty]

thank you!