Fix pos

Author: brianrourkeboll

tests/FSharp.Compiler.ComponentTests/Conformance/Constraints/Unmanaged.fs

@@ -95,7 +95,7 @@ test (ValueSome (struct {|Field = Some 42|}))
         |> withDiagnostics [
                 Error 1, Line 3, Col 17, Line 3, Col 22, "A generic construct requires that the type 'string' is an unmanaged type"
                 Error 1, Line 4, Col 28, Line 4, Col 33, "A generic construct requires that the type 'string' is an unmanaged type"
-                Error 1, Line 5, Col 18, Line 5, Col 44, "A generic construct requires that the type ''a option' is an unmanaged type" ]
+                Error 1, Line 5, Col 35, Line 5, Col 42, "A generic construct requires that the type ''a option' is an unmanaged type" ]
 
     [<Fact>]
     let ``Option not considered unmanaged`` () =