Simplify dentry point detection

Author: Licenser

README.md

@@ -6,7 +6,7 @@
 
 A collection of lints to catch common mistakes and improve your [Rust](https://github.com/rust-lang/rust) code.
 
-[There are 332 lints included in this crate!](https://rust-lang.github.io/rust-clippy/master/index.html)
+[There are 333 lints included in this crate!](https://rust-lang.github.io/rust-clippy/master/index.html)
 
 We have a bunch of lint categories to allow you to choose how much Clippy is supposed to ~~annoy~~ help you:
 

clippy_lints/src/exit.rs

@@ -33,31 +33,15 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Exit {
             if match_def_path(cx, def_id, &paths::EXIT);
             then {
                 let mut parent = cx.tcx.hir().get_parent_item(e.hir_id);
-                // We have to traverse the parents upwards until we find a function
-                // otherwise a exit in a let or if in main would still trigger this
-                loop{
-                    match cx.tcx.hir().find(parent) {
-                        Some(Node::Item(Item{ident, kind: ItemKind::Fn(..), ..})) => {
-                            // If we found a function we check it's name if it is
-                            // `main` we emit a lint.
-                            let def_id = cx.tcx.hir().local_def_id(parent);
-                            if !is_entrypoint_fn(cx, def_id) {
-                                span_lint(cx, EXIT, e.span, "usage of `process::exit`");
-                            }
-                            // We found any kind of function and can end our loop
-                            break;
-                        }
-                        // If we found anything but a funciton we continue with the
-                        // loop and go one parent up
-                        Some(_) => {
-                            parent = cx.tcx.hir().get_parent_item(parent);
-                        },
-                        // If we found nothing we break.
-                        None => break,
+                if let Some(Node::Item(Item{ident, kind: ItemKind::Fn(..), ..})) = cx.tcx.hir().find(parent) {
+                    // If the next item up is a function we check if it is an entry point
+                    // and only then emit a linter warning
+                    let def_id = cx.tcx.hir().local_def_id(parent);
+                    if !is_entrypoint_fn(cx, def_id) {
+                        span_lint(cx, EXIT, e.span, "usage of `process::exit`");
                     }
                 }
             }
-
         }
     }
 }

clippy_lints/src/lib.rs

@@ -500,6 +500,7 @@ pub fn register_plugins(store: &mut lint::LintStore, sess: &Session, conf: &Conf
         &eval_order_dependence::DIVERGING_SUB_EXPRESSION,
         &eval_order_dependence::EVAL_ORDER_DEPENDENCE,
         &excessive_precision::EXCESSIVE_PRECISION,
+        &exit::EXIT,
         &explicit_write::EXPLICIT_WRITE,
         &fallible_impl_from::FALLIBLE_IMPL_FROM,
         &format::USELESS_FORMAT,

src/lintlist/mod.rs

@@ -6,7 +6,7 @@ pub use lint::Lint;
 pub use lint::LINT_LEVELS;
 
 // begin lint list, do not remove this comment, it’s used in `update_lints`
-pub const ALL_LINTS: [Lint; 332] = [
+pub const ALL_LINTS: [Lint; 333] = [
     Lint {
         name: "absurd_extreme_comparisons",
         group: "correctness",