Enum CollectionMode

pub enum CollectionMode {
    UsedItems,
    MentionedItems,
}

See module-level docs of rustc_monomorphize::collector on some context for “mentioned” items.

Variants

UsedItems

Collect items that are used, i.e., actually needed for codegen.

Which items are used can depend on optimization levels, as MIR optimizations can remove uses.

MentionedItems

Collect items that are mentioned. The goal of this mode is that it is independent of optimizations: the set of “mentioned” items is computed before optimizations are run.

The exact contents of this set are not a stable guarantee. (For instance, it is currently computed after drop-elaboration. If we ever do some optimizations even in debug builds, we might decide to run them before computing mentioned items.) The key property of this set is that it is optimization-independent.