Segfault in Set Cover generator

[nkrit1]

Describe the bug

There is a segfault when creating new SetCover instance in example/libecole/src/branching.cpp.

Setting

• OS: Ubuntu 18.04
• Compiler: gcc 12.4.0
• Python version: 3.11.9
• Ecole version: 0.8.1 (last release)
• SCIP: 8.0.0 (passed as CMAKEARGS to ecole)
• CMake: 3.30.3
• xsimd: 8.1.0
• xtensor: 0.24.6
• xtensor-python: 0.26.1

To Reproduce

1. Just run branching.cpp example

Expected behavior

Generation of new SetCover instance.

Additional context

I use gdb for debugging and the main tread is paused on exception(segfault) and the bug is generated in generate_instance() in function set_slice().

[Lzu-Han]

how you install ecole?why i can't install it by pip or conda