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

> ### Name: bind
> ### Title: Bind rows (features) of sf objects
> ### Aliases: bind rbind.sf cbind.sf st_bind_cols
> 
> ### ** Examples
> 
> crs = st_crs(3857)
> a = st_sf(a=1, geom = st_sfc(st_point(0:1)), crs = crs)
> b = st_sf(a=1, geom = st_sfc(st_linestring(matrix(1:4,2))), crs = crs)
> c = st_sf(a=4, geom = st_sfc(st_multilinestring(list(matrix(1:4,2)))), crs = crs)
> rbind(a,b,c)
Simple feature collection with 3 features and 1 field
geometry type:  GEOMETRY
dimension:      XY
bbox:           xmin: 0 ymin: 1 xmax: 2 ymax: 4
CRS:            EPSG:3857
  a                         geom
1 1                  POINT (0 1)
2 1        LINESTRING (1 3, 2 4)
3 4 MULTILINESTRING ((1 3, 2 4))
> rbind(a,b)
Simple feature collection with 2 features and 1 field
geometry type:  GEOMETRY
dimension:      XY
bbox:           xmin: 0 ymin: 1 xmax: 2 ymax: 4
CRS:            EPSG:3857
  a                  geom
1 1           POINT (0 1)
2 1 LINESTRING (1 3, 2 4)
> rbind(a,b)
Simple feature collection with 2 features and 1 field
geometry type:  GEOMETRY
dimension:      XY
bbox:           xmin: 0 ymin: 1 xmax: 2 ymax: 4
CRS:            EPSG:3857
  a                  geom
1 1           POINT (0 1)
2 1 LINESTRING (1 3, 2 4)
> rbind(b,c)
Simple feature collection with 2 features and 1 field
geometry type:  GEOMETRY
dimension:      XY
bbox:           xmin: 1 ymin: 3 xmax: 2 ymax: 4
CRS:            EPSG:3857
  a                         geom
1 1        LINESTRING (1 3, 2 4)
2 4 MULTILINESTRING ((1 3, 2 4))
> cbind(a,b,c) # warns
Simple feature collection with 1 feature and 3 fields
Active geometry column: geom
geometry type:  POINT
dimension:      XY
bbox:           xmin: 0 ymin: 1 xmax: 0 ymax: 1
CRS:            EPSG:3857
  a a.1 a.2        geom                geom.1                       geom.2
1 1   1   4 POINT (0 1) LINESTRING (1 3, 2 4) MULTILINESTRING ((1 3, 2 4))
> if (require(dplyr))
+   dplyr::bind_cols(a,b)
Loading required package: dplyr

Attaching package: ‘dplyr’

The following objects are masked from ‘package:stats’:

    filter, lag

The following objects are masked from ‘package:base’:

    intersect, setdiff, setequal, union

New names:
* a -> a...1
* geom -> geom...2
* a -> a...3
* geom -> geom...4
Error in st_geometry.sf(x) : 
  attr(obj, "sf_column") does not point to a geometry column.
Did you rename it, without setting st_geometry(obj) <- "newname"?
Calls: <Anonymous> -> print.sf -> print -> st_geometry -> st_geometry.sf
Execution halted