On 7/30/13 10:05 AM, Graydon Hoare wrote:
Trickier call. We don't allow type ascription inside patterns, only at
the outermost level. I think we found that our grammars were
sufficiently similar that intermixing them inside one another produced
ambiguities, though I don't remember off hand which one. Possibly the
ambiguity between "{<field_name>:<pat>}" and "{<field_name>:<ty>}".
I actually don't think there's an ambiguity here any longer; type
ascription inside patterns seems like a useful feature to me.
Patrick
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