Auto merge of #4673 - Manishearth:rustup, r=phansch

Rustup to rustc 1.40.0-nightly (237d54f 2019-10-15)

changelog: none

Author: bors

clippy_lints/src/booleans.rs

@@ -255,7 +255,10 @@ fn simplify_not(cx: &LateContext<'_, '_>, expr: &Expr) -> Option<String> {
                 .iter()
                 .cloned()
                 .flat_map(|(a, b)| vec![(a, b), (b, a)])
-                .find(|&(a, _)| a == path.ident.name.as_str())
+                .find(|&(a, _)| {
+                    let path: &str = &path.ident.name.as_str();
+                    a == path
+                })
                 .and_then(|(_, neg_method)| Some(format!("{}.{}()", snippet_opt(cx, args[0].span)?, neg_method)))
         },
         _ => None,

clippy_lints/src/functions.rs

@@ -462,9 +462,12 @@ fn check_must_use_candidate<'a, 'tcx>(
 }
 
 fn must_use_attr(attrs: &[Attribute]) -> Option<&Attribute> {
-    attrs
-        .iter()
-        .find(|attr| attr.ident().map_or(false, |ident| "must_use" == &ident.as_str()))
+    attrs.iter().find(|attr| {
+        attr.ident().map_or(false, |ident| {
+            let ident: &str = &ident.as_str();
+            "must_use" == ident
+        })
+    })
 }
 
 fn returns_unit(decl: &hir::FnDecl) -> bool {