Fix precise field capture of univariant enums #97325
Merged
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When constructing a MIR from a THIR field expression, introduce an
additional downcast projection before accessing a field of an enum.
When rebasing a place builder on top of a captured place, account for
the fact that a single HIR enum field projection corresponds to two MIR
projection elements: a downcast element and a field element.
Fixes #95271.
Fixes #96299.
Fixes #96512.
Fixes #97378.
r? @nikomatsakis @arora-aman