Type Definition rustc_builtin_macros::deriving::generic::CombineSubstructureFunc

pub type CombineSubstructureFunc<'a> = Box<dyn FnMut(&mut ExtCtxt<'_>, Span, &Substructure<'_>) -> BlockOrExpr + 'a>;

Combine the values of all the fields together. The last argument is all the fields of all the structures.

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: 16 bytes