Struct marker_api::CtorBlocker

#[non_exhaustive]
#[repr(C)]
pub struct CtorBlocker { /* private fields */ }

This struct blocks the construction of enum variants, similar to the #[non_exhaustive] attribute.

Marker uses enums extensively, like ItemKind and ExprKind. There can be *Kind enums that wrap other *Kind enums. In those cases, this struct is used, to block the user from constructing the variant manually. This allows tools to handle the variants confidently without additional verification. An example for this would be the LitExprKind::UnaryOp variant.

This basically acts like a #[non_exhaustive] attribute, with the difference that it also works on tuple variants. Attaching #[non_exhaustive] to a tuple variant would make it private, which we don’t want.

As a normal user, you can just ignore this instance as it holds no relevant information for linting.

Trait Implementations

impl Clone for CtorBlocker

fn clone(&self) -> CtorBlocker

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for CtorBlocker

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Copy for CtorBlocker