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-rw-r--r--src/librustc/mir/interpret/error.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/librustc/mir/interpret/error.rs b/src/librustc/mir/interpret/error.rs
index 010b73db9ac..bd7d2c57509 100644
--- a/src/librustc/mir/interpret/error.rs
+++ b/src/librustc/mir/interpret/error.rs
@@ -578,7 +578,7 @@ impl InterpError<'_> {
     pub fn allocates(&self) -> bool {
         match self {
             // Zero-sized boxes do not allocate.
-            InterpError::MachineStop(b) => mem::size_of_val(&**b) > 0,
+            InterpError::MachineStop(b) => mem::size_of_val::<dyn MachineStopType>(&**b) > 0,
             InterpError::Unsupported(UnsupportedOpInfo::Unsupported(_))
             | InterpError::UndefinedBehavior(UndefinedBehaviorInfo::ValidationFailure(_))
             | InterpError::UndefinedBehavior(UndefinedBehaviorInfo::Ub(_))