Where is array type inference defined?

[jskeet]

We need this for stackalloc as well.
Discovered in #238.

[jskeet]

Perhaps 12.6.3.15?
https://github.com/dotnet/csharpstandard/blob/draft-v7/standard/expressions.md#126315-finding-the-best-common-type-of-a-set-of-expressions

[jskeet]

(Clearing from the 7.x milestone, as I don't think this is any worse than it was before.)