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lent
allows returning a (hidden) pointer to a member thus making Result slightly more efficient when working with types that are expensive to copy.lent
is enabled by default only on recent versions as Nim is known to generate invalid code in earlier releases - how far backlent
works reliably depends on where Result appears but versions as recent as 1.6.14 have been known to have issues.As such,
lent
support is conservatively enabled only for 2.0.8+ but can be enabled for earlier versoins as well via a compile-time define.