Generate a missing argument.

Generate a missing argument.

missing_arg()

Examples

f_interp(~f(x = uq(missing_arg())))
#> ~f(x = )
#> <environment: 0x5636a2a7aeb8>
f_interp(~f(x = uq(NULL)))
#> ~f(x = NULL)
#> <environment: 0x5636a2a7aeb8>