MapIterator.opIndexAssign

Undocumented in source. Be warned that the author may not have intended to support it.
struct MapIterator(Iterator, alias _fun)
ref scope
@optmath
static if(!__traits(compiles, &opIndex(ptrdiff_t.init)))
opIndexAssign
(
T
)
(
auto ref T value
,
ptrdiff_t index
)

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