Dear all,

  I'm getting the following error when I run the attached code (uses firedrake_adjoint). Did I do something silly or should I file a bug report?

all the best

--Colin

Traceback (most recent call last):

  File "outer.py", line 80, in <module>

    z0Solver.solve()

  File "/Users/colincotter/firedrake/src/pyadjoint/fenics_adjoint/variational_solver.py", line 48, in solve

    **sb_kwargs)

  File "/Users/colincotter/firedrake/src/pyadjoint/fenics_adjoint/solving.py", line 56, in __init__

    self._init_dependencies(*args, **kwargs)

  File "/Users/colincotter/firedrake/src/pyadjoint/fenics_adjoint/solving.py", line 137, in _init_dependencies

    self.add_dependency(bc.block_variable, no_duplicates=True)

  File "/Users/colincotter/firedrake/src/pyadjoint/pyadjoint/block.py", line 38, in add_dependency

    dep.will_add_as_dependency()

  File "/Users/colincotter/firedrake/src/pyadjoint/pyadjoint/block_variable.py", line 61, in will_add_as_dependency

    overwrite = self.output._ad_will_add_as_dependency()

  File "/Users/colincotter/firedrake/src/pyadjoint/pyadjoint/overloaded_type.py", line 332, in _ad_will_add_as_dependency

    self._ad_annotate_block()

  File "/Users/colincotter/firedrake/src/pyadjoint/pyadjoint/overloaded_type.py", line 349, in _ad_annotate_block

    block = self.block_class(*self._ad_args, **self._ad_kwargs)

  File "/Users/colincotter/firedrake/src/pyadjoint/fenics_adjoint/types/dirichletbc.py", line 90, in __init__

    self.collapsed_space = self.function_space.collapse()

  File "/Users/colincotter/firedrake/src/firedrake/firedrake/functionspaceimpl.py", line 212, in __getattr__

    return getattr(self.topological, name)

AttributeError: 'ProxyFunctionSpace' object has no attribute 'collapse'