building with the standart dub/dmd compiler fails

[egnrse]

On arch-linux using the latest dub/dmd package fails when trying to build (or test) this program.

DUB version 1.40.0, built on Apr 21 2025
DMD64 D Compiler v2.111.0

[elia@ArchPC-2T31KIJ trash-d]% dub build
     Warning /home/elia/Documents/Sources/trash-d/dub.json(5:1): versionName: Key is not a valid member of this section. Did you mean: version, versions, versionFilters
    Starting Performing "debug" build using /usr/bin/dmd for x86_64.
    Building trash-d 21.0.0: building configuration [application]
/usr/include/dlang/dmd/std/json.d(149,41): Error: non-constant expression `void`
        string                          str;
                                        ^
/usr/include/dlang/dmd/std/json.d(149,41): Error: non-constant expression `void`
        string                          str;
                                        ^
/usr/include/dlang/dmd/std/json.d(149,41): Error: non-constant expression `void`
        string                          str;
                                        ^
Error /usr/bin/dmd failed with exit code 1.

Using a different compiler (eg. dub build --compiler=ldc2) works.

[rushsteve1]

Hmm, this seems to be a difference between the constant analysis in DMD and LDC. The error message is odd though, I have no idea why it's pointing to that line. It's probably caused by this line:

trash-d/source/trash/ver.d

Line 13 in c6a9a85

const JSONValue DUB_JSON = import("dub.json").parseJSON();

I think this might ultimately be an upstream compiler issue, or a broader compatibility issue between DMD and LDC. For now I'm going to tag this issue "Won't Fix" but leave it open for future discussion.