Error: More than one storage layout definition.
 --> <stdin>:5:34:
  |
5 | contract C layout at 0x1234 is A layout at 0xABCD {
  |                                  ^^^^^^
Note: Previous definition:
 --> <stdin>:5:12:
  |
5 | contract C layout at 0x1234 is A layout at 0xABCD {
  |            ^^^^^^^^^^^^^^^^
