Rename CoroutineKind::Gen to ::Coroutine

compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs

@@ -2488,7 +2488,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                     AsyncCoroutineKind::Closure => "async closure",
                     _ => bug!("async block/closure expected, but async function found."),
                 },
-                CoroutineKind::Gen => "coroutine",
+                CoroutineKind::Coroutine => "coroutine",
             },
             None => "closure",
         };

compiler/rustc_borrowck/src/diagnostics/region_name.rs

@@ -698,7 +698,7 @@ impl<'tcx> MirBorrowckCtxt<'_, 'tcx> {
                             " of async function"
                         }
                     },
-                    Some(hir::CoroutineKind::Gen) => " of coroutine",
+                    Some(hir::CoroutineKind::Coroutine) => " of coroutine",
                     None => " of closure",
                 };
                 (span, mir_description, hir_ty)