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Ext of LinqBuilder #linq F#
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| type Microsoft.FSharp.Linq.QueryBuilder with | |
| [<CustomOperation("existsNot")>] | |
| member _.ExistsNot (source: QuerySource<'T, 'Q>, predicate) = | |
| Enumerable.Any (source.Source, Func<_,_>(predicate)) |> not |
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