# Type Alias rustc_middle::query::queries::dep_kind::ProvidedValue

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    pub type ProvidedValue<'tcx> = CrateDepKind;

Expand description

This type alias specifies the type returned from query providers and the type used for decoding. For regular queries this is the declared returned type `V`, but `arena_cache` will use `<V as Deref>::Target` instead.

## Aliased Type§

    enum ProvidedValue<'tcx> {
        MacrosOnly,
        Implicit,
        Explicit,
    }

## Variants§

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### MacrosOnly

A dependency that is only used for its macros.

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### Implicit

A dependency that is always injected into the dependency list and so doesn’t need to be linked to an rlib, e.g., the injected allocator.

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### Explicit

A dependency that is required by an rlib version of this crate. Ordinary `extern crate`s result in `Explicit` dependencies.

## Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain `repr(...)` attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 1 byte

Size for each variant:

- `MacrosOnly`: 0 bytes
- `Implicit`: 0 bytes
- `Explicit`: 0 bytes