hasChild

True if child M1 in A has a child M2.

  1. eponymoustemplate hasChild(alias A, string M)
  2. alias hasChild(alias A, string M1, string M2) = hasChild!(getChild!(A, M1), M2)
    alias hasChild(alias A, string M1, string M2) = hasChild!(getChild!(A, M1), M2)

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