Guards in pattern matching → nested if
Many systems and monoliths that have been built a long time ago were also modular, but their modules were mostly based on the classical Three-tier Architecture. Such a setup has a low testability, because the Business layer required the Data Access Layer (DAL) to operate even in unit tests (or you had to do a code surgery to find seams, if there were ones).
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Уехавший из России комик рассказал о сотрудниках спецслужб на концертахКомик Белый заявил, что на его концерте в Ницце приходили сотрудники спецслужб