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reflect: add comment about Type.Field allocation
R=golang-dev, bradfitz, r CC=golang-dev https://golang.org/cl/5586044
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@ -789,6 +789,14 @@ func (t *structType) Field(i int) (f StructField) {
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f.Tag = StructTag(*p.tag)
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}
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f.Offset = p.offset
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// NOTE(rsc): This is the only allocation in the interface
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// presented by a reflect.Type. It would be nice to avoid,
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// at least in the common cases, but we need to make sure
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// that misbehaving clients of reflect cannot affect other
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// uses of reflect. One possibility is CL 5371098, but we
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// postponed that ugliness until there is a demonstrated
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// need for the performance. This is issue 2320.
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f.Index = []int{i}
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return
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}
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