tibble() gives inconsistent error messages for duplicate column names

[huftis]

tibble() gives inconsistent error message for duplicate column names. See the following reprex:

library(tibble)
tibble(x1 = 1, x1 = 1)
#> Error: Column `x1` must have a unique name
tibble(x2 = 2, x1 = 1, x1 = 1)
#> Error: Column `x1` must have a unique name
tibble(x1 = 1, x1 = 1, x2 = 2)
#> Error: Data source must be a dictionary

Note that the last error message is different from the previous error messages, even though the cause of the error is identical.

I tested this with the latest GitGub version of the tibble package.

[krlmlr]

Thanks for bringing this up, it helped discovering an apparent regression with the lst() function.

[github-actions]

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