[Issue 23523] New: Allow User-Defined Implicit Conversions for const/immutable containers

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23523

          Issue ID: 23523
           Summary: Allow User-Defined Implicit Conversions for
                    const/immutable containers
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: john.michael.hall at gmail.com

>From here (among other places) on the forum
https://forum.dlang.org/post/ooraoriyrftjrpoygtnk@forum.dlang.org

Allow `const type!T` to convert to `type!(const T)`
Similarly, allow `immutable type!T` to convert to `type!(immutable T)`

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