plus

operator fun <N : Number> KNonNullExpression<N>.plus(right: KNonNullExpression<N>): KNonNullExpression<N>
operator fun <N : Number> KNonNullExpression<N>.plus(right: N): KNonNullExpression<N>
operator fun <N : Number> KExpression<N>.plus(right: KExpression<N>): KNullableExpression<N>
operator fun <N : Number> KExpression<N>.plus(right: N): KNullableExpression<N>