Struct optional parameter with caller info attributes will fails in type check

[ijklam]

Struct optional parameter with caller info attributes will fails in type check.

Repro steps

Sample code:

open System.Runtime.CompilerServices
type Ab() =
  static member aa ([<CallerMemberName; Struct>]?b: string) = 
    b

Expected behavior

Can successfully be compiled.

Actual behavior

Provide a description of the actual behaviour observed.

Known workarounds

Do not use struct optional parameter.