P0847 Deducing this

[jensmaurer]

P0847R2 Deducing this (Gašper Ažman, Simon Brand, Ben Deane, Barry Revzin)

[jfbastien]

We've seen this before in EWG, but looks like EWG is short on time for KOA. Tagging for EWGI help.

[jfbastien]

We want a feature to drive deduction to deducing to a specific type.
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We’d like to hear Library implementor feedback.
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We’d like implementation experience.
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(A vote: don’t think experience is necessary right now)
We’re generally favorable to this paper, we have feedback and EWG can see it again.
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