P1260R0 Pattern Matching #363 and P1308R0 Pattern Matching #364 were seen by EWGI in SAN.
Strong support, authors got feedback to address.

EWG in Kona

P1371R1 Pattern Matching (Sergei Murzin, Michael Park, David Sankel, Dan Sarginson)

EWG in Cologne

EWG saw this: http://wiki.edg.com/bin/view/Wg21belfast/P1371-EWG

EWG is interested in hearing more about pattern matching in the general direction presented

P1371R2 Pattern Matching (Sergei Murzin, Michael Park, David Sankel, Dan Sarginson)

EWG Prague on Tuesday afternoon:

Pattern matching should require a case that always matches.

Assuming we don’t mandate a case that always matches, if no case matched, we get UB.

Drop the expression form.

Drop the statement form.

Pattern matching shouldn’t have arbitrary lookahead.

EWG Prague Friday afternoon, discuss design tuning: an update from earlier this week, Pattern_Matching_Updates.pdf

Non-void inspect expressions should have at least one pattern which, on its own, can match every possible value.

We discussed exhaustiveness checking in today's EWG telecon, and took the following poll:

POLL We like the presented approach to exhaustiveness checking in pattern matching.

EWG discussed "inspect is always an expression" in a telecon today.

POLL: Allow break and continue leaving from inspect expressions.

Lots of other feedback was given to the authors, and everyone agreed to more exploration. We did not poll these.

P1371R3 Pattern Matching (Michael Park, Bruno Cardoso Lopes, Sergei Murzin, David Sankel, Dan Sarginson, Bjarne Stroustrup)

Today in the EWG telecon, we discussed goto in pattern actions. Polls:

Support goto jumping into a pattern.

Support goto jumping out of a pattern, when the goto jumps forward, not across a variable declaration or into a nested scope.

Support goto jumping out of a pattern, without additional constraints.

Support goto which remains strictly within its pattern.

Bjarne wrote a short paper to start our discussion, and will come back with a bigger paper which covers all the cases and feedback received.

Bruno presented his implementation experience to EWG on 2021-02-25.
Godbolt demo: https://godbolt.org/z/fdd5j4
Feedback was given to the authors.

EWG discussed Pattern matching identifier patterns syntax: let vs auto vs none on April 8th.

POLL: annotate id-pattern with auto.

inspect (e) { // like this:
 
  auto&& x => binds

  x => matches

}

POLL: if we annotate id-patterns with let.

inspect (e) { // like this:

  let x => binds

  x => matches

}

POLL: keep the current p1371r3 proposal with case.

inspect (e) { // like this:

  x => // binds

  case x => matches

}

Adding needs-revision, this got EWG feedback in April of '21.