`rustc_hir_analysis`: some general code improvements

[rust.git] / compiler / rustc_hir_analysis / src / lib.rs

diff --git a/compiler/rustc_hir_analysis/src/lib.rs b/compiler/rustc_hir_analysis/src/lib.rs
index ddc5b7668812668e9e6f923956ba85bd0a2cb484..97fff85f424c3a9d3175039e61d0197dc578292f 100644 (file)
--- a/compiler/rustc_hir_analysis/src/lib.rs
+++ b/compiler/rustc_hir_analysis/src/lib.rs
@@ -114,6 +114,7 @@
 use rustc_trait_selection::traits::{self, ObligationCause, ObligationCauseCode};
 
 use std::iter;
+use std::ops::Not;
 
 use astconv::AstConv;
 use bounds::Bounds;
@@ -203,12 +204,8 @@ fn main_fn_generics_params_span(tcx: TyCtxt<'_>, def_id: DefId) -> Option<Span>
         }
         let hir_id = tcx.hir().local_def_id_to_hir_id(def_id.expect_local());
         match tcx.hir().find(hir_id) {
-            Some(Node::Item(hir::Item { kind: hir::ItemKind::Fn(_, ref generics, _), .. })) => {
-                if !generics.params.is_empty() {
-                    Some(generics.span)
-                } else {
-                    None
-                }
+            Some(Node::Item(hir::Item { kind: hir::ItemKind::Fn(_, generics, _), .. })) => {
+                generics.params.is_empty().not().then(|| generics.span)
             }
             _ => {
                 span_bug!(tcx.def_span(def_id), "main has a non-function type");