diff options
Diffstat (limited to 'tvix/eval/src/lib.rs')
| -rw-r--r-- | tvix/eval/src/lib.rs | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/tvix/eval/src/lib.rs b/tvix/eval/src/lib.rs index 6cf3aa212a..00f680bc7a 100644 --- a/tvix/eval/src/lib.rs +++ b/tvix/eval/src/lib.rs @@ -22,6 +22,8 @@ mod test_utils; #[cfg(test)] mod tests; +use std::rc::Rc; + // Re-export the public interface used by other crates. pub use crate::builtins::global_builtins; pub use crate::compiler::{compile, prepare_globals}; @@ -31,3 +33,9 @@ pub use crate::pretty_ast::pretty_print_expr; pub use crate::source::SourceCode; pub use crate::value::Value; pub use crate::vm::run_lambda; + +// TODO: use Rc::unwrap_or_clone once it is stabilised. +// https://doc.rust-lang.org/std/rc/struct.Rc.html#method.unwrap_or_clone +pub fn unwrap_or_clone_rc<T: Clone>(rc: Rc<T>) -> T { + Rc::try_unwrap(rc).unwrap_or_else(|rc| (*rc).clone()) +} |