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Poor error message when "missing" format objects #114

MichaelChirico opened this issue Oct 30, 2018 · 2 comments


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commented Oct 30, 2018

I made the mistake not to include some of the named elements & was met with a very strange error it took me a while to figure out:

Error in as.character(.transformer(expr, env)) :
cannot coerce type 'closure' to vector of type 'character'

This is because my input was actually a named function (and even though closure should have been a dead giveaway on this I spent 10 minutes + debugging):

glue::glue_data(list(x = 1), '{x} cannot be bigger than {stop}')

I'm not sure any easy way to fix this/give a more helpful message, but if so it could save time debugging.


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commented Jan 4, 2019

We will look into this during the Tidy dev day at RStudio::conf.

I think the easiest way to fix it would be to have glue use a small wrapper around as.character() which provides a more informative error message than the default when the coercion fails.


Line 105 in fcdfa61

f <- function(expr) as.character(.transformer(expr, env))

ref. tidyverse error messages


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commented Jan 19, 2019

claiming! first stop reprex!

jimhester added a commit that referenced this issue Jan 26, 2019

More informative error message if function is interpolated (#123)
We now test if the string is a function and throw an error if so, with the caveat that crayon functions can be coerced to characters with `as.character()` (and are in the vignette) so we only error if that coercion fails.

Fixes #114
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