in which elided-lifetimes-in-paths receives a promotion to Idioms 2018

We also conscientiously note where current work has fallen short.

This is for rust-lang#52041.

Author: zackmdavis

src/librustc/middle/resolve_lifetime.rs

@@ -2129,7 +2129,8 @@ impl<'a, 'tcx> LifetimeContext<'a, 'tcx> {
                 replace_span,
                 "indicate the anonymous lifetime",
                 suggestion.to_owned(),
-                Applicability::MachineApplicable
+                // false positives observed with macros, `Ref::map` (tracking issue #52041)
+                Applicability::MaybeIncorrect
             );
         }
         err.emit();

src/librustc_lint/lib.rs

@@ -44,8 +44,9 @@ extern crate syntax_pos;
 
 use rustc::lint;
 use rustc::lint::{LateContext, LateLintPass, LintPass, LintArray};
-use rustc::lint::builtin::{BARE_TRAIT_OBJECTS, ABSOLUTE_PATHS_NOT_STARTING_WITH_CRATE};
-use rustc::lint::builtin::MACRO_USE_EXTERN_CRATE;
+use rustc::lint::builtin::{BARE_TRAIT_OBJECTS, ABSOLUTE_PATHS_NOT_STARTING_WITH_CRATE,
+                           ELIDED_LIFETIMES_IN_PATHS, MACRO_USE_EXTERN_CRATE};
+
 use rustc::session;
 use rustc::util;
 use rustc::hir;
@@ -183,6 +184,7 @@ pub fn register_builtins(store: &mut lint::LintStore, sess: Option<&Session>) {
                     UNREACHABLE_PUB,
                     UNUSED_EXTERN_CRATES,
                     MACRO_USE_EXTERN_CRATE,
+                    ELIDED_LIFETIMES_IN_PATHS,
                     ELLIPSIS_INCLUSIVE_RANGE_PATTERNS);
 
     // Guidelines for creating a future incompatibility lint: