> repaired_names(letters[1:3])
[1] "a" "b" "c"

> repaired_names("")
Error: Column 1 must be named.

> repaired_names(c("a", "a"))
Error: Column name `a` must not be duplicated.

> repaired_names("..1")
Error: Column 1 must not have names of the form ... or ..j.

> repaired_names(c("a", "a"), .name_repair = "universal")
Message: New names:
* a -> a...1
* a -> a...2

[1] "a...1" "a...2"

> repaired_names(c("a", "a"), .name_repair = "universal", quiet = TRUE)
[1] "a...1" "a...2"

> repaired_names(c("if"), .name_repair = "universal")
Message: New names:
* `if` -> .if

[1] ".if"

