From 4028b093e468afad4896a1658924e3e3f3b8f57c Mon Sep 17 00:00:00 2001
From: Camille GILLOT <gillot.camille@gmail.com>
Date: Sat, 2 Oct 2021 22:55:04 +0200
Subject: [PATCH] Do not ICE if some foreign expansions were not encoded.

The metadata encoder does not necessarily encode all expansions, only
those which are referenced in other metadata fields.
---
 compiler/rustc_metadata/src/rmeta/decoder.rs | 2 --
 1 file changed, 2 deletions(-)

diff --git a/compiler/rustc_metadata/src/rmeta/decoder.rs b/compiler/rustc_metadata/src/rmeta/decoder.rs
index ffb7fdacd22..9b97d1a4762 100644
--- a/compiler/rustc_metadata/src/rmeta/decoder.rs
+++ b/compiler/rustc_metadata/src/rmeta/decoder.rs
@@ -1646,8 +1646,6 @@ impl<'a, 'tcx> CrateMetadataRef<'a> {
                     let i = ExpnIndex::from_u32(i);
                     if let Some(hash) = self.root.expn_hashes.get(self, i) {
                         map.insert(hash.decode(self), i);
-                    } else {
-                        panic!("Missing expn_hash entry for {:?}", i);
                     }
                 }
                 map