Maps in storage

Maps are not assigned pointers, because they do not have a location in storage. They are instead assigned a nonce that is used to derive the location of keyed values during runtime.

Example:

contract Foo {
  bar: Map<address, u256> # bar is assigned a static nonce by the compiler
  baz: Map<address, Map<address, u256>> # baz is assigned a static nonce by the compiler
}

The expression bar[0x00] would resolve to the hash of both bar's nonce and the key value .i.e. keccak256(<bar nonce>, 0x00). Similarly, the expression baz[0x00][0x01] would resolve to a nested hash i.e. keccak256(keccak256(<baz nonce>, 0x00), 0x01).