Function map_offset_overflow 

pub fn map_offset_overflow<E>(
    error: OffsetOverflow,
    on_overflow: impl FnOnce(usize) -> E,
) -> E

Maps an OffsetOverflow into a caller-chosen error via on_overflow.

Replaces the per-crate map_offset_overflow copies: each builder crate passes a closure constructing its own typed IdOverflow { value } variant.

Performance

This function is O(1).