[swift-dev] prefix map ambiguous

[Kelvin Ma]

when I write sequence.prefix(n).map(f) the compiler complains that .prefix
is ambiguous. If I replace it with [..<n] it works fine. Why is this
happening? I found SR-1856 <https://bugs.swift.org/browse/SR-1856> which
looks like a similar issue but it’s marked fixed.
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