Patterns.UnionCaseTest Active Pattern (F#)
Recognizes expressions that represent an operation that tests whether a value is of a particular union case.
Namespace/Module Path: Microsoft.FSharp.Quotations.Patterns
Assembly: FSharp.Core (in FSharp.Core.dll)
The formal return type is (Expr * UnionCaseInfo) option. The option indicates whether the input results in a match. In a pattern matching expression, the input is decomposed into a tuple of two elements. The first element is the expression that represents the target of the test and the second element is the UnionCaseInfo object that represents the union case.