From 9e78ce068bb649738d489bf3cc9d701aa9a47b1e Mon Sep 17 00:00:00 2001
From: Chris Simpkins <git.simpkins@gmail.com>
Date: Mon, 10 Feb 2020 11:31:55 -0500
Subject: [PATCH] handle TerminatorKind::Yield by returning Err(Unpromotable)

---
 src/librustc_mir/transform/promote_consts.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/librustc_mir/transform/promote_consts.rs b/src/librustc_mir/transform/promote_consts.rs
index 9a7f3f86a6fc..a5d59860c3d1 100644
--- a/src/librustc_mir/transform/promote_consts.rs
+++ b/src/librustc_mir/transform/promote_consts.rs
@@ -463,6 +463,7 @@ impl<'tcx> Validator<'_, 'tcx> {
                 let terminator = self.body[loc.block].terminator();
                 match &terminator.kind {
                     TerminatorKind::Call { func, args, .. } => self.validate_call(func, args),
+                    TerminatorKind::Yield { .. } => Err(Unpromotable),
                     kind => {
                         span_bug!(terminator.source_info.span, "{:?} not promotable", kind);
                     }