dolfinx.fem.Expression containing only a dolfinx.fem.Constant fails

[nate-sime]

Perhaps I've done something silly, but consider

import dolfinx
from mpi4py import MPI

mesh = dolfinx.mesh.create_unit_square(MPI.COMM_WORLD, 1, 1)
V = dolfinx.fem.FunctionSpace(mesh, ("CG", 1))
val = dolfinx.fem.Constant(mesh, 1.0)
expr = dolfinx.fem.Expression(val, V.element.interpolation_points())

which throws

Traceback (most recent call last):
  File "$HOME/bb/interpconstant.py", line 7, in <module>
    expr = dolfinx.fem.Expression(val*val, V.element.interpolation_points())
  File "$HOME/local/local/lib/python3.10/dist-packages/dolfinx/fem/function.py", line 117, in __init__
    self._ufcx_expression, module, self._code = jit.ffcx_jit(mesh.comm, (ufl_expression, _X),
  File "$HOME/local/local/lib/python3.10/dist-packages/dolfinx/jit.py", line 56, in mpi_jit
    return local_jit(*args, **kwargs)
  File "$HOME/local/local/lib/python3.10/dist-packages/dolfinx/jit.py", line 211, in ffcx_jit
    r = ffcx.codegeneration.jit.compile_expressions([ufl_object], parameters=p_ffcx, **p_jit)
  File "$HOME/local/local/lib/python3.10/dist-packages/ffcx/codegeneration/jit.py", line 210, in compile_expressions
    ffcx.naming.compute_signature(expressions, _compute_parameter_signature(p)
  File "$HOME/local/local/lib/python3.10/dist-packages/ffcx/naming.py", line 62, in compute_signature
    signature = ufl.algorithms.signature.compute_expression_signature(expr, rn)
  File "$HOME/local/local/lib/python3.10/dist-packages/ufl/algorithms/signature.py", line 118, in compute_expression_signature
    terminal_hashdata = compute_terminal_hashdata([expr], renumbering)
  File "$HOME/local/local/lib/python3.10/dist-packages/ufl/algorithms/signature.py", line 64, in compute_terminal_hashdata
    data = expr._ufl_signature_data_(renumbering)
  File "$HOME/local/local/lib/python3.10/dist-packages/ufl/constant.py", line 72, in _ufl_signature_data_
    self._ufl_domain._ufl_signature_data_(renumbering), repr(self._ufl_shape),
  File "$HOME/local/local/lib/python3.10/dist-packages/ufl/domain.py", line 121, in _ufl_signature_data_
    return ("Mesh", renumbering[self], self._ufl_coordinate_element)
KeyError: Mesh(VectorElement(FiniteElement('Lagrange', triangle, 1), dim=2), 0)

[jorgensd]

Possibly introduced with FEniCS/ufl#113