Streamline coroutine_kind_label.

Author: nnethercote

Diff for: compiler/rustc_codegen_ssa/src/debuginfo/type_names.rs

@@ -576,33 +576,20 @@ pub fn push_item_name(tcx: TyCtxt<'_>, def_id: DefId, qualified: bool, output: &
 }
 
 fn coroutine_kind_label(coroutine_kind: Option<CoroutineKind>) -> &'static str {
+    use CoroutineDesugaring::*;
+    use CoroutineKind::*;
+    use CoroutineSource::*;
     match coroutine_kind {
-        Some(CoroutineKind::Desugared(CoroutineDesugaring::Gen, CoroutineSource::Block)) => {
-            "gen_block"
-        }
-        Some(CoroutineKind::Desugared(CoroutineDesugaring::Gen, CoroutineSource::Closure)) => {
-            "gen_closure"
-        }
-        Some(CoroutineKind::Desugared(CoroutineDesugaring::Gen, CoroutineSource::Fn)) => "gen_fn",
-        Some(CoroutineKind::Desugared(CoroutineDesugaring::Async, CoroutineSource::Block)) => {
-            "async_block"
-        }
-        Some(CoroutineKind::Desugared(CoroutineDesugaring::Async, CoroutineSource::Closure)) => {
-            "async_closure"
-        }
-        Some(CoroutineKind::Desugared(CoroutineDesugaring::Async, CoroutineSource::Fn)) => {
-            "async_fn"
-        }
-        Some(CoroutineKind::Desugared(CoroutineDesugaring::AsyncGen, CoroutineSource::Block)) => {
-            "async_gen_block"
-        }
-        Some(CoroutineKind::Desugared(CoroutineDesugaring::AsyncGen, CoroutineSource::Closure)) => {
-            "async_gen_closure"
-        }
-        Some(CoroutineKind::Desugared(CoroutineDesugaring::AsyncGen, CoroutineSource::Fn)) => {
-            "async_gen_fn"
-        }
-        Some(CoroutineKind::Coroutine(_)) => "coroutine",
+        Some(Desugared(Gen, Block)) => "gen_block",
+        Some(Desugared(Gen, Closure)) => "gen_closure",
+        Some(Desugared(Gen, Fn)) => "gen_fn",
+        Some(Desugared(Async, Block)) => "async_block",
+        Some(Desugared(Async, Closure)) => "async_closure",
+        Some(Desugared(Async, Fn)) => "async_fn",
+        Some(Desugared(AsyncGen, Block)) => "async_gen_block",
+        Some(Desugared(AsyncGen, Closure)) => "async_gen_closure",
+        Some(Desugared(AsyncGen, Fn)) => "async_gen_fn",
+        Some(Coroutine(_)) => "coroutine",
         None => "closure",
     }
 }