Running examples in ‘stars-Ex.R’ failed
The error most likely occurred in:

> base::assign(".ptime", proc.time(), pos = "CheckExEnv")
> ### Name: aggregate.stars
> ### Title: spatially or temporally aggregate stars object
> ### Aliases: aggregate.stars aggregate
> 
> ### ** Examples
> 
> # aggregate time dimension in format Date
> tif = system.file("tif/L7_ETMs.tif", package = "stars")
> t1 = as.Date("2018-07-31")
> x = read_stars(c(tif, tif, tif, tif), along = list(time = c(t1, t1+1, t1+2, t1+3)))[,1:30,1:30]
> st_get_dimension_values(x, "time")
[1] "2018-07-31" "2018-08-01" "2018-08-02" "2018-08-03"
> x_agg_time = aggregate(x, by = t1 + c(0, 2, 4), FUN = max) 
> 
> # aggregate time dimension in format Date - interval
> by_t = "2 days"
> x_agg_time2 = aggregate(x, by = by_t, FUN = max) 
> st_get_dimension_values(x_agg_time2, "time")
[1] "2018-07-31" "2018-08-02"
> #TBD:
> #x_agg_time - x_agg_time2
> 
> # aggregate time dimension in format POSIXct
> x = st_set_dimensions(x, 4, values = as.POSIXct(c("2018-07-31", 
+                                                   "2018-08-01", 
+                                                   "2018-08-02", 
+                                                   "2018-08-03")), 
+                       names = "time")
> by_t = as.POSIXct(c("2018-07-31", "2018-08-02"))
> x_agg_posix = aggregate(x, by = by_t, FUN = max)
> st_get_dimension_values(x_agg_posix, "time")
[1] "2018-07-31 CEST" "2018-08-02 CEST"
> #TBD:
> # x_agg_time - x_agg_posix
> aggregate(x, "2 days", mean)
stars object with 4 dimensions and 1 attribute
attribute(s):
             Min. 1st Qu. Median     Mean 3rd Qu. Max.
L7_ETMs.tif    17      43     58 57.58796      70  145
dimension(s):
     from to          offset  delta                     refsys point x/y
time    1  2 2018-07-31 CEST 2 days                    POSIXct    NA    
x       1 30          288776   28.5 SIRGAS 2000 / UTM zone 25S FALSE [x]
y       1 30         9120761  -28.5 SIRGAS 2000 / UTM zone 25S FALSE [y]
band    1  6              NA     NA                         NA    NA    
> if (require(ncmeta, quietly = TRUE)) {
+  # Spatial aggregation, see https://github.com/r-spatial/stars/issues/299
+  prec_file = system.file("nc/test_stageiv_xyt.nc", package = "stars")
+  prec = read_ncdf(prec_file, curvilinear = c("lon", "lat"))
+  prec_slice = dplyr::slice(prec, index = 17, along = "time")
+  nc = sf::read_sf(system.file("gpkg/nc.gpkg", package = "sf"), "nc.gpkg")
+  nc = st_transform(nc, st_crs(prec_slice))
+  agg = aggregate(prec_slice, st_geometry(nc), mean)
+  plot(agg)
+ }
no 'var' specified, using Total_precipitation_surface_1_Hour_Accumulation
other available variables:
 lat, lon, time
Error in vectbl_assign(x[[j]], i, recycled_value[[j]]) : 
  DLL requires the use of native symbols
Calls: read_ncdf ... tbl_subassign_row -> withCallingHandlers -> vectbl_assign
Execution halted