there is bug in Lint/DuplicateHashKey cop

[Ivanov-Anton]

The "Lint/DuplicateHashKey" cop in Robocop does not correctly flag offenses for duplicate hash keys in the provided code snippets.

Code Snippet 1:

ACTIONS = {
  HAS_1 => {
    SUB_HASH_1 => 'string',
    SUB_HASH_2 => 'string',
    SUB_HASH_3 => 'string',
    SUB_HASH_4 => 'string',
    SUB_HASH_5 => 'string',
    SUB_HASH_1 => 'string'
    
  }.freeze,
}.freeze

Expected Behavior:

According to the "Lint/DuplicateHashKey" cop, the duplicate key "SUB_HASH_1" should be flagged as an offense. However, in the provided code snippet, the cop does not generate any offense and ignores the duplicate key.

Code Snippet 2:

resource_classes = {
  PAS::REST::MAIN => {
    plan: :main_plan
  },
  RAM::REST::MAIN => {
    second_plan: :second_plan_value
  },
  PAS::REST::MAIN => {
    # some commented line
  }
}

Expected Behavior:

Similarly, the cop should flag the duplicate key "PAS::REST::MAIN" as an offense in the above code snippet. However, it fails to do so.

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Environment:

robocop version: "1.52.1"