Remove unwrap_none/expect_none from compiler/.

compiler/rustc_codegen_ssa/src/lib.rs

@@ -1,6 +1,6 @@
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
+#![feature(assert_matches)]
 #![feature(bool_to_option)]
-#![feature(option_expect_none)]
 #![feature(box_patterns)]
 #![feature(drain_filter)]
 #![feature(try_blocks)]

compiler/rustc_middle/src/ich/impls_syntax.rs

@@ -45,7 +45,11 @@ impl<'ctx> rustc_ast::HashStableContext for StableHashingContext<'ctx> {
             item.hash_stable(self, hasher);
             style.hash_stable(self, hasher);
             span.hash_stable(self, hasher);
-            tokens.as_ref().expect_none("Tokens should have been removed during lowering!");
+            assert_matches!(
+                tokens.as_ref(),
+                None,
+                "Tokens should have been removed during lowering!"
+            );
         } else {
             unreachable!();
         }

compiler/rustc_middle/src/lib.rs

@@ -24,6 +24,7 @@
 
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![feature(array_windows)]
+#![feature(assert_matches)]
 #![feature(assoc_char_funcs)]
 #![feature(backtrace)]
 #![feature(bool_to_option)]
@@ -38,7 +39,6 @@
 #![feature(extern_types)]
 #![feature(nll)]
 #![feature(once_cell)]
-#![feature(option_expect_none)]
 #![feature(or_patterns)]
 #![feature(min_specialization)]
 #![feature(trusted_len)]

compiler/rustc_middle/src/mir/interpret/allocation.rs

@@ -339,7 +339,7 @@ impl<'tcx, Tag: Copy, Extra: AllocationExtra<Tag>> Allocation<Tag, Extra> {
         for dest in bytes {
             *dest = src.next().expect("iterator was shorter than it said it would be");
         }
-        src.next().expect_none("iterator was longer than it said it would be");
+        assert_matches!(src.next(), None, "iterator was longer than it said it would be");
         Ok(())
     }
 

compiler/rustc_mir/src/interpret/memory.rs

@@ -854,7 +854,11 @@ impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> Memory<'mir, 'tcx, M> {
             Some(ptr) => ptr,
             None => {
                 // zero-sized access
-                src.next().expect_none("iterator said it was empty but returned an element");
+                assert_matches!(
+                    src.next(),
+                    None,
+                    "iterator said it was empty but returned an element"
+                );
                 return Ok(());
             }
         };
@@ -880,7 +884,11 @@ impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> Memory<'mir, 'tcx, M> {
             Some(ptr) => ptr,
             None => {
                 // zero-sized access
-                src.next().expect_none("iterator said it was empty but returned an element");
+                assert_matches!(
+                    src.next(),
+                    None,
+                    "iterator said it was empty but returned an element"
+                );
                 return Ok(());
             }
         };
@@ -894,7 +902,7 @@ impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> Memory<'mir, 'tcx, M> {
             let offset_ptr = ptr.offset(Size::from_bytes(idx) * 2, &tcx)?; // `Size` multiplication
             allocation.write_scalar(&tcx, offset_ptr, val.into(), Size::from_bytes(2))?;
         }
-        src.next().expect_none("iterator was longer than it said it would be");
+        assert_matches!(src.next(), None, "iterator was longer than it said it would be");
         Ok(())
     }
 

compiler/rustc_mir/src/lib.rs

@@ -7,6 +7,7 @@ Rust MIR: a lowered representation of Rust.
 #![feature(nll)]
 #![feature(in_band_lifetimes)]
 #![feature(array_windows)]
+#![feature(assert_matches)]
 #![feature(bindings_after_at)]
 #![feature(bool_to_option)]
 #![feature(box_patterns)]
@@ -18,13 +19,13 @@ Rust MIR: a lowered representation of Rust.
 #![feature(exact_size_is_empty)]
 #![feature(exhaustive_patterns)]
 #![feature(never_type)]
+#![feature(map_try_insert)]
 #![feature(min_specialization)]
 #![feature(trusted_len)]
 #![feature(try_blocks)]
 #![feature(associated_type_defaults)]
 #![feature(stmt_expr_attributes)]
 #![feature(trait_alias)]
-#![feature(option_expect_none)]
 #![feature(option_get_or_insert_default)]
 #![feature(or_patterns)]
 #![feature(once_cell)]

compiler/rustc_mir/src/transform/coverage/debug.rs

@@ -285,10 +285,8 @@ impl DebugCounters {
                 ),
             };
             counters
-                .insert(id, DebugCounter::new(counter_kind.clone(), some_block_label))
+                .try_insert(id, DebugCounter::new(counter_kind.clone(), some_block_label))
-                .expect_none(
+                .expect("attempt to add the same counter_kind to DebugCounters more than once");
-                    "attempt to add the same counter_kind to DebugCounters more than once",
-                );
         }
     }
 
@@ -479,9 +477,9 @@ impl GraphvizData {
         counter_kind: &CoverageKind,
     ) {
         if let Some(edge_to_counter) = self.some_edge_to_counter.as_mut() {
-            edge_to_counter.insert((from_bcb, to_bb), counter_kind.clone()).expect_none(
+            edge_to_counter
-                "invalid attempt to insert more than one edge counter for the same edge",
+                .try_insert((from_bcb, to_bb), counter_kind.clone())
-            );
+                .expect("invalid attempt to insert more than one edge counter for the same edge");
         }
     }
 

compiler/rustc_mir/src/transform/deduplicate_blocks.rs

@@ -86,7 +86,7 @@ fn find_duplicates<'a, 'tcx>(body: &'a Body<'tcx>) -> FxHashMap<BasicBlock, Basi
                 // The basic block was already in the hashmap, which means we have a duplicate
                 let value = *occupied.get();
                 debug!("Inserting {:?} -> {:?}", bb, value);
-                duplicates.insert(bb, value).expect_none("key was already inserted");
+                duplicates.try_insert(bb, value).expect("key was already inserted");
             }
             Entry::Vacant(vacant) => {
                 vacant.insert(bb);

compiler/rustc_span/src/hygiene.rs

@@ -118,7 +118,8 @@ impl ExpnId {
         HygieneData::with(|data| {
             let old_expn_data = &mut data.expn_data[self.0 as usize];
             assert!(old_expn_data.is_none(), "expansion data is reset for an expansion ID");
-            expn_data.orig_id.replace(self.as_u32()).expect_none("orig_id should be None");
+            assert_eq!(expn_data.orig_id, None);
+            expn_data.orig_id = Some(self.as_u32());
             *old_expn_data = Some(expn_data);
         });
         update_disambiguator(self)
@@ -202,7 +203,8 @@ impl HygieneData {
     fn fresh_expn(&mut self, mut expn_data: Option<ExpnData>) -> ExpnId {
         let raw_id = self.expn_data.len() as u32;
         if let Some(data) = expn_data.as_mut() {
-            data.orig_id.replace(raw_id).expect_none("orig_id should be None");
+            assert_eq!(data.orig_id, None);
+            data.orig_id = Some(raw_id);
         }
         self.expn_data.push(expn_data);
         ExpnId(raw_id)
@@ -1410,9 +1412,11 @@ fn update_disambiguator(expn_id: ExpnId) {
             let new_hash: Fingerprint = hasher.finish();
 
             HygieneData::with(|data| {
-                data.expn_data_disambiguators
+                assert_eq!(
-                    .get(&new_hash)
+                    data.expn_data_disambiguators.get(&new_hash),
-                    .expect_none("Hash collision after disambiguator update!");
+                    None,
+                    "Hash collision after disambiguator update!",
+                );
             });
         };
     }

compiler/rustc_span/src/lib.rs

@@ -21,7 +21,6 @@
 #![feature(negative_impls)]
 #![feature(nll)]
 #![feature(min_specialization)]
-#![feature(option_expect_none)]
 
 #[macro_use]
 extern crate rustc_macros;
@@ -1996,7 +1995,8 @@ impl<CTX: HashStableContext> HashStable<CTX> for ExpnId {
                 if cache.len() < new_len {
                     cache.resize(new_len, None);
                 }
-                cache[index].replace(sub_hash).expect_none("Cache slot was filled");
+                let prev = cache[index].replace(sub_hash);
+                assert_eq!(prev, None, "Cache slot was filled");
             });
             sub_hash.hash_stable(ctx, hasher);
         }