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pattern analysis: Store field indices in `DeconstructedPat` to avoid virtual wildcards
For a pattern like `Struct { field3: true, .. }`, in pattern analysis we represent it as `Struct { field1: _, field2: _, field3: true, field4: _ }`. This PR makes it so we store `Struct { field3: true, .. }` instead. This means we never have to create fake `_` patterns during lowering.
r? ``@compiler-errors``
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