tree d4fe6d4f1c656a0e7342c0ca8568a3a027bd53b6
parent 22a42d4c1ea5bc2bc70f3b7fda2362b0d28f7a85
author xinau <felix.ehrenpfort@codecentric.de> 1570142209 +0000
committer Marcel van Lohuizen <mpvl@golang.org> 1570192456 +0000

pkg/list: adding flatten function as a builtin

this commit adds a new builtin to the list package for generating a
flat list from a nested lists by expanding nested lists in place.

for instance

    list.Flatten([1, [[2, 3], []], [4]])

results in

    [1, 2, 3, 4]

Change-Id: Ia462f7f2db504fd49601a3c77c0fae9387c038c4
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/3460
Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>