X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=clippy_lints%2Fsrc%2Fminmax.rs;h=b02c993de526b0478cacbcfc990f17d752d454f4;hb=2ff568d746e4641b992c0b74bea046e43a637997;hp=22bc25094bea2d9127f85faef637a56c92a94c0d;hpb=fe96ffeac98481433c33e3e9f49a56f70f8ec134;p=rust.git

diff --git a/clippy_lints/src/minmax.rs b/clippy_lints/src/minmax.rs
index 22bc25094be..b02c993de52 100644
--- a/clippy_lints/src/minmax.rs
+++ b/clippy_lints/src/minmax.rs
@@ -1,8 +1,8 @@
 use crate::consts::{constant_simple, Constant};
-use crate::utils::{match_def_path, opt_def_id, paths, span_lint};
-use rustc::hir::*;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::utils::{match_def_path, paths, span_lint};
+use rustc_hir::{Expr, ExprKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
 use std::cmp::Ordering;
 
 declare_clippy_lint! {
@@ -15,7 +15,7 @@
     /// **Known problems:** None
     ///
     /// **Example:**
-    /// ```rust
+    /// ```ignore
     /// min(0, max(100, x))
     /// ```
     /// It will always be equal to `0`. Probably the author meant to clamp the value
@@ -25,20 +25,10 @@
     "`min(_, max(_, _))` (or vice versa) with bounds clamping the result to a constant"
 }
 
-pub struct MinMaxPass;
-
-impl LintPass for MinMaxPass {
-    fn get_lints(&self) -> LintArray {
-        lint_array!(MIN_MAX)
-    }
-
-    fn name(&self) -> &'static str {
-        "MinMax"
-    }
-}
+declare_lint_pass!(MinMaxPass => [MIN_MAX]);
 
 impl<'a, 'tcx> LateLintPass<'a, 'tcx> for MinMaxPass {
-    fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr) {
+    fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr<'_>) {
         if let Some((outer_max, outer_c, oe)) = min_max(cx, expr) {
             if let Some((inner_max, inner_c, ie)) = min_max(cx, oe) {
                 if outer_max == inner_max {
@@ -54,7 +44,7 @@ fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr) {
                             cx,
                             MIN_MAX,
                             expr.span,
-                            "this min/max combination leads to constant result",
+                            "this `min`/`max` combination leads to constant result",
                         );
                     },
                 }
@@ -69,13 +59,13 @@ enum MinMax {
     Max,
 }
 
-fn min_max<'a>(cx: &LateContext<'_, '_>, expr: &'a Expr) -> Option<(MinMax, Constant, &'a Expr)> {
-    if let ExprKind::Call(ref path, ref args) = expr.node {
-        if let ExprKind::Path(ref qpath) = path.node {
-            opt_def_id(cx.tables.qpath_def(qpath, path.hir_id)).and_then(|def_id| {
-                if match_def_path(cx.tcx, def_id, &paths::CMP_MIN) {
+fn min_max<'a>(cx: &LateContext<'_, '_>, expr: &'a Expr<'a>) -> Option<(MinMax, Constant, &'a Expr<'a>)> {
+    if let ExprKind::Call(ref path, ref args) = expr.kind {
+        if let ExprKind::Path(ref qpath) = path.kind {
+            cx.tables.qpath_res(qpath, path.hir_id).opt_def_id().and_then(|def_id| {
+                if match_def_path(cx, def_id, &paths::CMP_MIN) {
                     fetch_const(cx, args, MinMax::Min)
-                } else if match_def_path(cx.tcx, def_id, &paths::CMP_MAX) {
+                } else if match_def_path(cx, def_id, &paths::CMP_MAX) {
                     fetch_const(cx, args, MinMax::Max)
                 } else {
                     None
@@ -89,7 +79,11 @@ fn min_max<'a>(cx: &LateContext<'_, '_>, expr: &'a Expr) -> Option<(MinMax, Cons
     }
 }
 
-fn fetch_const<'a>(cx: &LateContext<'_, '_>, args: &'a [Expr], m: MinMax) -> Option<(MinMax, Constant, &'a Expr)> {
+fn fetch_const<'a>(
+    cx: &LateContext<'_, '_>,
+    args: &'a [Expr<'a>],
+    m: MinMax,
+) -> Option<(MinMax, Constant, &'a Expr<'a>)> {
     if args.len() != 2 {
         return None;
     }