ROOT produces incorrect dictionary for constrained class templates

[greenc-FNAL]

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Description

The attached reproducer will fail to execute the ROOT Python script successfully when the buggy::Constraint class template is constrained instead of producing identical output to when buggy::Constraint is not constrianed:

$ ./makeit good
number = 5

$ ./makeit
Error in <TInterpreter::AutoParse>: Error parsing payload code for class buggy::Constrained with content:
⋮

Reproducer

To induce the failure case:

$ cd root-concepts-dict-bug
$ ./makeit

To see the reference output:

$ cd root-concepts-dict-bug
$ ./makeit good

ROOT version

ROOT 6.28/04@30598a8430

Installation method

UPS

Operating system

SL7

Additional context

Compiled with GCC 13.1.0/C++20.

[greenc-FNAL]

root-concepts-dict-bug.tar.gz

[greenc-FNAL]

Trying to build the head of v6-28-00-patches (currently 281a162) to reproduce against.

[greenc-FNAL]

Trying to build the head of v6-28-00-patches (currently 281a162) to reproduce against.

Does not build currently...

[jalopezg-git]

Trying to build the head of v6-28-00-patches (currently 281a162) to reproduce against.

Does not build currently...

@greenc-FNAL Thanks for reporting this and providing a reproducer! Any chance that you can try with ROOT from the master branch too?

[pcanal]

There is no reason for this to be fixed in the master (since LLVM version is not changed yet)

[greenc-FNAL]

Trying to build the head of v6-28-00-patches (currently 281a162) to reproduce against.

Does not build currently...

@greenc-FNAL Thanks for reporting this and providing a reproducer! Any chance that you can try with ROOT from the master branch too?

Might take me a while, but I'll get on it. Is the HEAD generally reasonable, or is there a particular commit I should build from?

[greenc-FNAL]

Bug is reproduced on 4f0450b.

[greenc-FNAL]

Bump?