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#let out = ()
// Values of array.
#for v in (1, 2, 3) {
out += (v,)
}
// Indices and values of array.
#for (i, v) in ("1", "2", "3").enumerate() {
test(repr(i + 1), v)
}
// Pairs of dictionary.
#for v in (a: 4, b: 5) {
out += (v,)
}
// Keys and values of dictionary.
#for (k, v) in (a: 6, b: 7) {
out += (k,)
out += (v,)
}
#test(out, (1, 2, 3, ("a", 4), ("b", 5), "a", 6, "b", 7))
// Grapheme clusters of string.
#let first = true
#let joined = for c in "abc👩👩👦👦" {
if not first { ", " }
first = false
c
}
#test(joined, "a, b, c, 👩👩👦👦")
// Return value.
#test(for v in "" [], none)
#test(type(for v in "1" []), "content")
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