library(tidyverse)
mtcars %>%
filter(mgp < 20)
#> Error: Problem with `filter()` input `..1`.
#> x object 'mgp' not found
#> ℹ Input `..1` is `mgp < 20`.
#> Backtrace:
#> █
#> 1. └─mtcars %>% filter(mgp < 20)
#> 2. ├─base::withVisible(eval(quote(`_fseq`(`_lhs`)), env, env))
#> 3. └─base::eval(quote(`_fseq`(`_lhs`)), env, env)
#> 4. └─base::eval(quote(`_fseq`(`_lhs`)), env, env)
#> 5. └─`_fseq`(`_lhs`)
#> 6. └─magrittr::freduce(value, `_function_list`)
#> 7. ├─base::withVisible(function_list[[k]](value))
#> 8. └─function_list[[k]](value)
#> 9. ├─dplyr::filter(., mgp < 20)
#> 10. └─dplyr:::filter.data.frame(., mgp < 20)
#> 11. └─dplyr:::filter_rows(.data, ...)
#> 12. └─base::tryCatch(...)
#> 13. └─base:::tryCatchList(expr, classes, parentenv, handlers)
#> 14. └─base:::tryCatchOne(expr, names, parentenv, handlers[[1L]])
#> 15. └─value[[3L]](cond)
#> 16. └─dplyr:::stop_dplyr(...)
Created on 2021-02-17 by the reprex package (v1.0.0)