please help me submit a bug!

[jfondren]

On Saturday, 9 October 2021 at 05:46:50 UTC, jfondren wrote:
> I don't quite get it, but it looks like your `enum T A` is 
> treated like a manifest constant

https://dlang.org/spec/enum.html#manifest_constants

Note, the spec doesn't have the "copy and paste" language that 
people use to describe the pitfall with enum array literals. I 
think that behavior's purely implied by enums not referring to 
runtime locations:

>Manifest constants are not lvalues, meaning their address cannot 
>be taken. They exist only in the memory of the compiler.
>Better, the manifest constant has no runtime location in the 
>executable.

With the `const T A` version, `A.b` refers to a specific location 
in the process's memory. With the `enum T A` version, `A.b` since 
it's in a runtime context must build the struct on the spot, and 
since the struct is mutable (unlike a string's bytes) it must be 
freshly constructed on each occurrence.