make UB during CTFE a hard error

RalfJung · RalfJung · commit 3c08cf8e5e33 · 2021-06-18T16:00:04.000+02:00
diff --git a/compiler/rustc_middle/src/mir/interpret/error.rs b/compiler/rustc_middle/src/mir/interpret/error.rs
@@ -525,6 +525,7 @@ impl InterpError<'_> {
         use InterpError::*;
         match *self {
             MachineStop(ref err) => err.is_hard_err(),
+            InterpError::UndefinedBehavior(_) => true,
             _ => false,
         }
     }

Original file line number	Diff line number	Diff line change
`@@ -525,6 +525,7 @@ impl InterpError<'_> {`
`525`	`525`	`use InterpError::*;`
`526`	`526`	`match *self {`
`527`	`527`	`MachineStop(ref err) => err.is_hard_err(),`
	`528`	`+ InterpError::UndefinedBehavior(_) => true,`
`528`	`529`	`_ => false,`
`529`	`530`	`}`
`530`	`531`	`}`