{flat_,}map_identity: recognize (tuple) struct de- and restructuring
#15261
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makes the code a bit more concise by removing the need for explicit `.iter()`
the match arms above put the "sanity" checks in the guard, and call only `check_pat` in the body. With this commit, the (tuple) struct cases follow that convention as well. Well, almost -- I think the ident check belongs to the second category of checks, so I put it in the body as well
this'll probably be marginally faster thanks to the equality check being now structural
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Follow-up of #15229, as described in #15229 (comment) -- it turned out to be not that difficult after all!
changelog: [
map_identity,flat_map_identity]: also recognize (tuple) struct de- and resctructuringr? @y21