tribble: "Can't merge the outer name" error introduced in v 3

[misea]

A recent-ish change in tribble broke some existing code of mine.

If a value supplied to tribble has a name of its own, tribble now returns a "Can't merge the outer name" error. Reports an error 3.0.1 and I know it used to work in 2.0.1, though I'm not sure when it broke

# This now fails in tibble 3.0.1, worked in 2.0.1
library(tribble)

v <- c(a = 1)
tribble(~a, v[1])

# Error: Can't merge the outer name `a` with a vector of length > 1.
# Please supply a `.name_spec` specification.

# This works
w = c(1)
tribble(~a, w[1])

[hadley]

Somewhat more minimal reprex:

tibble::tribble(~ x, c(a = 1))
#> Error: Can't merge the outer name `x` with a vector of length > 1.
#> Please supply a `.name_spec` specification.

^{Created on 2020-06-05 by the reprex package (v0.3.0)}

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