Auto merge of rust-lang#96376 - scottmcm:do-yeet, r=oli-obk

Add `do yeet` expressions to allow experimentation in nightly

Two main goals for this:
- Ensure that trait restructuring in rust-lang#84277 (comment) doesn't accidentally close us off from the possibility of doing this in future, as sketched in https://rust-lang.github.io/rfcs/3058-try-trait-v2.html#possibilities-for-yeet
- Experiment with the *existence* of syntax for this, to be able to weight the syntax-vs-library tradeoffs better than we can right now.  Notably the syntax (with `do`) and name in this PR are not intended as candidates for stabilization, but they make a good v0 PR for adding this with minimal impact to compiler maintenance or priming one possible name choice over another.

r? `@oli-obk`
The lang `second` for doing this: rust-lang/lang-team#160 (comment)

Tracking issues
- Lang, rust-lang#96373
- Libs-api, rust-lang#96374

Author: bors

core/src/ops/mod.rs

@@ -187,6 +187,9 @@ pub use self::range::OneSidedRange;
 #[unstable(feature = "try_trait_v2", issue = "84277")]
 pub use self::try_trait::{FromResidual, Try};
 
+#[unstable(feature = "try_trait_v2_yeet", issue = "96374")]
+pub use self::try_trait::Yeet;
+
 #[unstable(feature = "try_trait_v2_residual", issue = "91285")]
 pub use self::try_trait::Residual;
 

core/src/ops/try_trait.rs

@@ -330,6 +330,22 @@ pub trait FromResidual<R = <Self as Try>::Residual> {
     fn from_residual(residual: R) -> Self;
 }
 
+#[cfg(not(bootstrap))]
+#[unstable(
+    feature = "yeet_desugar_details",
+    issue = "none",
+    reason = "just here to simplify the desugaring; will never be stabilized"
+)]
+#[inline]
+#[track_caller] // because `Result::from_residual` has it
+#[lang = "from_yeet"]
+pub fn from_yeet<T, Y>(yeeted: Y) -> T
+where
+    T: FromResidual<Yeet<Y>>,
+{
+    FromResidual::from_residual(Yeet(yeeted))
+}
+
 /// Allows retrieving the canonical type implementing [`Try`] that has this type
 /// as its residual and allows it to hold an `O` as its output.
 ///
@@ -395,3 +411,9 @@ impl<T> FromResidual for NeverShortCircuit<T> {
 impl<T> Residual<T> for NeverShortCircuitResidual {
     type TryType = NeverShortCircuit<T>;
 }
+
+/// Implement `FromResidual<Yeet<T>>` on your type to enable
+/// `do yeet expr` syntax in functions returning your type.
+#[unstable(feature = "try_trait_v2_yeet", issue = "96374")]
+#[derive(Debug)]
+pub struct Yeet<T>(pub T);

core/src/option.rs

@@ -2287,6 +2287,14 @@ impl<T> const ops::FromResidual for Option<T> {
     }
 }
 
+#[unstable(feature = "try_trait_v2_yeet", issue = "96374")]
+impl<T> ops::FromResidual<ops::Yeet<()>> for Option<T> {
+    #[inline]
+    fn from_residual(ops::Yeet(()): ops::Yeet<()>) -> Self {
+        None
+    }
+}
+
 #[unstable(feature = "try_trait_v2_residual", issue = "91285")]
 impl<T> ops::Residual<T> for Option<convert::Infallible> {
     type TryType = Option<T>;

core/src/result.rs

@@ -2107,6 +2107,14 @@ impl<T, E, F: ~const From<E>> const ops::FromResidual<Result<convert::Infallible
     }
 }
 
+#[unstable(feature = "try_trait_v2_yeet", issue = "96374")]
+impl<T, E, F: From<E>> ops::FromResidual<ops::Yeet<E>> for Result<T, F> {
+    #[inline]
+    fn from_residual(ops::Yeet(e): ops::Yeet<E>) -> Self {
+        Err(From::from(e))
+    }
+}
+
 #[unstable(feature = "try_trait_v2_residual", issue = "91285")]
 impl<T, E> ops::Residual<T> for Result<convert::Infallible, E> {
     type TryType = Result<T, E>;