Try out yeet in the MIR interpreter

Author: scottmcm

compiler/rustc_const_eval/src/lib.rs

@@ -20,6 +20,7 @@ Rust MIR: a lowered representation of Rust.
 #![feature(trusted_len)]
 #![feature(trusted_step)]
 #![feature(try_blocks)]
+#![feature(yeet_expr)]
 #![recursion_limit = "256"]
 #![allow(rustc::potential_query_instability)]
 

compiler/rustc_middle/src/lib.rs

@@ -58,6 +58,7 @@
 #![feature(decl_macro)]
 #![feature(drain_filter)]
 #![feature(intra_doc_pointers)]
+#![feature(yeet_expr)]
 #![recursion_limit = "512"]
 #![allow(rustc::potential_query_instability)]
 

compiler/rustc_middle/src/mir/interpret/mod.rs

@@ -56,7 +56,7 @@ macro_rules! err_machine_stop {
 // In the `throw_*` macros, avoid `return` to make them work with `try {}`.
 #[macro_export]
 macro_rules! throw_unsup {
-    ($($tt:tt)*) => { Err::<!, _>(err_unsup!($($tt)*))? };
+    ($($tt:tt)*) => { do yeet err_unsup!($($tt)*) };
 }
 
 #[macro_export]
@@ -66,12 +66,12 @@ macro_rules! throw_unsup_format {
 
 #[macro_export]
 macro_rules! throw_inval {
-    ($($tt:tt)*) => { Err::<!, _>(err_inval!($($tt)*))? };
+    ($($tt:tt)*) => { do yeet err_inval!($($tt)*) };
 }
 
 #[macro_export]
 macro_rules! throw_ub {
-    ($($tt:tt)*) => { Err::<!, _>(err_ub!($($tt)*))? };
+    ($($tt:tt)*) => { do yeet err_ub!($($tt)*) };
 }
 
 #[macro_export]
@@ -81,12 +81,12 @@ macro_rules! throw_ub_format {
 
 #[macro_export]
 macro_rules! throw_exhaust {
-    ($($tt:tt)*) => { Err::<!, _>(err_exhaust!($($tt)*))? };
+    ($($tt:tt)*) => { do yeet err_exhaust!($($tt)*) };
 }
 
 #[macro_export]
 macro_rules! throw_machine_stop {
-    ($($tt:tt)*) => { Err::<!, _>(err_machine_stop!($($tt)*))? };
+    ($($tt:tt)*) => { do yeet err_machine_stop!($($tt)*) };
 }
 
 mod allocation;

compiler/rustc_mir_transform/src/lib.rs

@@ -9,6 +9,7 @@
 #![feature(option_get_or_insert_default)]
 #![feature(trusted_step)]
 #![feature(try_blocks)]
+#![feature(yeet_expr)]
 #![recursion_limit = "256"]
 
 #[macro_use]