Either.map

Undocumented in source. Be warned that the author may not have intended to support it.
struct Either(A, string NameA, B, string NameB)
const
T
map
(
T
)
(
T delegate
(
A
)
dgA
,
T delegate
(
B
)
dgB
)
if (
!is(A == B)
)

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