rust/src/libsyntax
bors 097c04cf43 Auto merge of #58315 - gnzlbg:returns_twice, r=alexcrichton
Implement unstable ffi_return_twice attribute

This PR implements [RFC2633](https://github.com/rust-lang/rfcs/pull/2633)

r? @eddyb
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The syntax crate contains those things concerned purely with syntax that is, the AST ("abstract syntax tree"), parser, pretty-printer, lexer, macro expander, and utilities for traversing ASTs.

For more information about how these things work in rustc, see the rustc guide: