Make DefPathHash->DefId panic for if the mapping fails.

We only use this mapping for cases where we know that it must succeed.
Letting it panic otherwise makes it harder to use the API in unsupported
ways.

3 files changed, 7 insertions, 7 deletions

diff --git a/compiler/rustc_middle/src/dep_graph/dep_node.rs b/compiler/rustc_middle/src/dep_graph/dep_node.rs
index 3f28cd51af7..e788dd4be85 100644
--- a/compiler/rustc_middle/src/dep_graph/dep_node.rs
+++ b/compiler/rustc_middle/src/dep_graph/dep_node.rs
@@ -336,7 +336,11 @@ impl DepNodeExt for DepNode {
     /// has been removed.
     fn extract_def_id(&self, tcx: TyCtxt<'tcx>) -> Option<DefId> {
         if self.kind.can_reconstruct_query_key() {
-            tcx.on_disk_cache.as_ref()?.def_path_hash_to_def_id(tcx, DefPathHash(self.hash.into()))
+            Some(
+                tcx.on_disk_cache
+                    .as_ref()?
+                    .def_path_hash_to_def_id(tcx, DefPathHash(self.hash.into())),
+            )
         } else {
             None
         }
diff --git a/compiler/rustc_middle/src/middle/cstore.rs b/compiler/rustc_middle/src/middle/cstore.rs
index b66260c5de3..81c44b27033 100644
--- a/compiler/rustc_middle/src/middle/cstore.rs
+++ b/compiler/rustc_middle/src/middle/cstore.rs
@@ -202,7 +202,7 @@ pub trait CrateStore: std::fmt::Debug {
     fn stable_crate_id_to_crate_num(&self, stable_crate_id: StableCrateId) -> CrateNum;
 
     /// Fetch a DefId from a DefPathHash for a foreign crate.
-    fn def_path_hash_to_def_id(&self, cnum: CrateNum, hash: DefPathHash) -> Option<DefId>;
+    fn def_path_hash_to_def_id(&self, cnum: CrateNum, hash: DefPathHash) -> DefId;
     fn expn_hash_to_expn_id(&self, cnum: CrateNum, index_guess: u32, hash: ExpnHash) -> ExpnId;
 
     // utility functions
diff --git a/compiler/rustc_middle/src/ty/context.rs b/compiler/rustc_middle/src/ty/context.rs
index a13fe75fd4d..706c3959433 100644
--- a/compiler/rustc_middle/src/ty/context.rs
+++ b/compiler/rustc_middle/src/ty/context.rs
@@ -83,11 +83,7 @@ pub trait OnDiskCache<'tcx>: rustc_data_structures::sync::Sync {
     /// Converts a `DefPathHash` to its corresponding `DefId` in the current compilation
     /// session, if it still exists. This is used during incremental compilation to
     /// turn a deserialized `DefPathHash` into its current `DefId`.
-    fn def_path_hash_to_def_id(
-        &self,
-        tcx: TyCtxt<'tcx>,
-        def_path_hash: DefPathHash,
-    ) -> Option<DefId>;
+    fn def_path_hash_to_def_id(&self, tcx: TyCtxt<'tcx>, def_path_hash: DefPathHash) -> DefId;
 
     fn drop_serialized_data(&self, tcx: TyCtxt<'tcx>);