How to preserve function parameters scopeness

[Simen Kjærås]

On Thursday, 6 June 2019 at 09:45:08 UTC, Ivan Butygin wrote:
> I want to extract function parameters types from declaration, 
> remove some of them and construct new function pointer type 
> from remaining types. Doing this in obvious way cause
> parameters to lost their scope storage class: 
> https://run.dlang.io/is/cQBFRW
>
> I can extract and store scope information separately via 
> ParameterStorageClassTuple but I don't know how to apply this 
> information back when constructing new function pointer type. 
> Of course I can CTFE string representation with full 
> declaration and mixin it but it's ugly and probably slow to 
> compile. Any ideas how to do this better?
>
> I need this for my jit-bind template machinery, if someone 
> interested
> https://github.com/ldc-developers/ldc/blob/master/runtime/jit-rt/d/ldc/dynamic_compile.d#L120

As far as I know, this is currently impossible without CTFE and 
mixins. FWIW, it's filed here: 
https://issues.dlang.org/show_bug.cgi?id=19787

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   Simen