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[Garth Wells <732543@xxxxxxxxxxxxxxxxxx>]

Because we don't require users to provide a vector of the correct
length, e.g. an uninitialised vector can be passed in.

We could require that it be correctly sized, which could make things
simpler in parallel because in parallel the size is only half the story.
The other half if the story is how a vector is partitioned across
processes.

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https://bugs.launchpad.net/bugs/732543

Title:
  No error when attempting to solve using wrong dimensions

Status in DOLFIN:
  New

Bug description:
  Calling solve with a vector of non-matching dimensions does not
  produce an error. Something mysterious happens instead. Reproduce with
  below code.

  from dolfin import *

  mesh = UnitSquare(2, 2)

  V = FunctionSpace(mesh, "CG", 1)
  Q = FunctionSpace(mesh, "CG", 1)
  W = V * Q

  y = TrialFunction(W)
  w = TestFunction(W)

  a = inner(y, w)*dx
  L = w[0]*dx

  A = assemble(a)
  b = assemble(L)
  y = Function(W)

  info(A)
  info(b)
  u = Function(V)
  info(u.vector())
  solve(A, u.vector(), b)
  info(u.vector())