Code Inspection: '#[Pure]' attribute can be added
Configure inspections: Settings | Editor | Inspections
Show intention actions: AltEnter
Reports the functions that are non-trivially pure. Such functions have other functions calls in their body, but all such calls do not produce any side effects.
Place the caret at the highlighted line and press AltEnter or click
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Click the arrow next to the inspection you want to suppress and select the necessary suppress action.