cur_data gives error?

[fkgruber]

cur_data does not work with lazy_dt
With data.frame

mtcars %>% group_by(cyl) %>% summarise((function(df)df[1,])(cur_data())) %>% as.data.frame
`summarise()` ungrouping output (override with `.groups` argument)
  cyl  mpg disp  hp drat   wt  qsec vs am gear carb
1   4 22.8  108  93 3.85 2.32 18.61  1  1    4    1
2   6 21.0  160 110 3.90 2.62 16.46  0  1    4    4
3   8 18.7  360 175 3.15 3.44 17.02  0  0    3    2

with lazy_dt

> lazy_dt(mtcars) %>% group_by(cyl) %>% summarise((function(df)df[1,])(cur_data())) %>% as.data.frame
Error: `cur_data()` must only be used inside dplyr verbs.
Run `rlang::last_error()` to see where the error occurred.
> 

Session info:

R version 3.6.3 (2020-02-29)
Platform: x86_64-apple-darwin15.6.0 (64-bit)
Running under: macOS Catalina 10.15.6

Matrix products: default
BLAS:   /Library/Frameworks/R.framework/Versions/3.6/Resources/lib/libRblas.0.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/3.6/Resources/lib/libRlapack.dylib

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] dtplyr_1.0.1 dplyr_1.0.2 

loaded via a namespace (and not attached):
 [1] crayon_1.3.4      R6_2.4.1          lifecycle_0.2.0   magrittr_1.5     
 [5] pillar_1.4.6      rlang_0.4.7       data.table_1.12.8 vctrs_0.3.4      
 [9] generics_0.0.2    ellipsis_0.3.1    tools_3.6.3       glue_1.4.2       
[13] purrr_0.3.3       compiler_3.6.3    pkgconfig_2.0.3   tidyselect_1.1.0 
[17] tibble_3.0.3     
> 

[pskopnik]

Same for cur_group_id(). Probably these methods are simply not implemented yet.