Nothing
Code
interpolate(1)
Condition
Error in `interpolate()`:
! `prompt` must be a single string, not the number 1.
Code
interpolate("x", 1)
Condition
Error in `interpolate()`:
! All elements of `...` must be named
Code
interpolate("{{x}}", x = 1:2)
Condition
Error in `interpolate()`:
! Must generate a single string.
i Did you accidentally include a vector in `...``?
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