Auto merge of #4941 - lzutao:utils-mod, r=phansch

a few small cleanups

changelog: none

clippy_dev/src/main.rs

@@ -1,9 +1,5 @@
 #![cfg_attr(feature = "deny-warnings", deny(warnings))]
 
-extern crate clap;
-extern crate clippy_dev;
-extern crate regex;
-
 use clap::{App, Arg, SubCommand};
 use clippy_dev::*;
 

clippy_dummy/Cargo.toml

@@ -14,4 +14,4 @@ keywords = ["clippy", "lint", "plugin"]
 categories = ["development-tools", "development-tools::cargo-plugins"]
 
 [build-dependencies]
-term = "0.5.1"
+term = "0.6"

clippy_dummy/build.rs

@@ -1,42 +1,42 @@
-extern crate term;
+use term::color::{GREEN, RED, WHITE};
+use term::{Attr, Error, Result};
 
 fn main() {
-    if let Err(_) = foo() {
-        eprintln!("error: Clippy is no longer available via crates.io\n");
-        eprintln!("help: please run `rustup component add clippy` instead");
+    if foo().is_err() {
+        eprintln!(
+            "error: Clippy is no longer available via crates.io\n\n\
+             help: please run `rustup component add clippy` instead"
+        );
     }
     std::process::exit(1);
 }
 
-fn foo() -> Result<(), ()> {
-    let mut t = term::stderr().ok_or(())?;
+fn foo() -> Result<()> {
+    let mut t = term::stderr().ok_or(Error::NotSupported)?;
 
-    t.attr(term::Attr::Bold).map_err(|_| ())?;
-    t.fg(term::color::RED).map_err(|_| ())?;
-    write!(t, "\nerror: ").map_err(|_| ())?;
+    t.attr(Attr::Bold)?;
+    t.fg(RED)?;
+    write!(t, "\nerror: ")?;
 
+    t.reset()?;
+    t.fg(WHITE)?;
+    writeln!(t, "Clippy is no longer available via crates.io\n")?;
 
-    t.reset().map_err(|_| ())?;
-    t.fg(term::color::WHITE).map_err(|_| ())?;
-    writeln!(t, "Clippy is no longer available via crates.io\n").map_err(|_| ())?;
+    t.attr(Attr::Bold)?;
+    t.fg(GREEN)?;
+    write!(t, "help: ")?;
 
+    t.reset()?;
+    t.fg(WHITE)?;
+    write!(t, "please run `")?;
 
-    t.attr(term::Attr::Bold).map_err(|_| ())?;
-    t.fg(term::color::GREEN).map_err(|_| ())?;
-    write!(t, "help: ").map_err(|_| ())?;
+    t.attr(Attr::Bold)?;
+    write!(t, "rustup component add clippy")?;
 
+    t.reset()?;
+    t.fg(WHITE)?;
+    writeln!(t, "` instead")?;
 
-    t.reset().map_err(|_| ())?;
-    t.fg(term::color::WHITE).map_err(|_| ())?;
-    write!(t, "please run `").map_err(|_| ())?;
-
-    t.attr(term::Attr::Bold).map_err(|_| ())?;
-    write!(t, "rustup component add clippy").map_err(|_| ())?;
-
-    t.reset().map_err(|_| ())?;
-    t.fg(term::color::WHITE).map_err(|_| ())?;
-    writeln!(t, "` instead").map_err(|_| ())?;
-
-    t.reset().map_err(|_| ())?;
+    t.reset()?;
     Ok(())
 }

clippy_lints/src/consts.rs

@@ -252,18 +252,11 @@ impl<'c, 'cc> ConstEvalLateContext<'c, 'cc> {
                     if let ExprKind::Path(qpath) = &callee.kind;
                     let res = self.tables.qpath_res(qpath, callee.hir_id);
                     if let Some(def_id) = res.opt_def_id();
-                    let get_def_path = self.lcx.get_def_path(def_id, );
-                    let def_path = get_def_path
-                        .iter()
-                        .copied()
-                        .map(Symbol::as_str)
-                        .collect::<Vec<_>>();
-                    if def_path[0] == "core";
-                    if def_path[1] == "num";
-                    if def_path[3] == "max_value";
-                    if def_path.len() == 4;
+                    let def_path: Vec<_> = self.lcx.get_def_path(def_id).into_iter().map(Symbol::as_str).collect();
+                    let def_path: Vec<&str> = def_path.iter().map(|s| &**s).collect();
+                    if let ["core", "num", int_impl, "max_value"] = *def_path;
                     then {
-                       let value = match &*def_path[2] {
+                       let value = match int_impl {
                            "<impl i8>" => i8::max_value() as u128,
                            "<impl i16>" => i16::max_value() as u128,
                            "<impl i32>" => i32::max_value() as u128,

clippy_lints/src/utils/mod.rs

@@ -869,16 +869,11 @@ pub fn remove_blocks(expr: &Expr) -> &Expr {
     if let ExprKind::Block(ref block, _) = expr.kind {
         if block.stmts.is_empty() {
             if let Some(ref expr) = block.expr {
-                remove_blocks(expr)
-            } else {
-                expr
+                return remove_blocks(expr);
             }
-        } else {
-            expr
         }
-    } else {
-        expr
     }
+    expr
 }
 
 pub fn is_self(slf: &Param) -> bool {
@@ -1228,12 +1223,13 @@ pub fn if_sequence(mut expr: &Expr) -> (SmallVec<[&Expr; 1]>, SmallVec<[&Block;
 }
 
 pub fn parent_node_is_if_expr<'a, 'b>(expr: &Expr, cx: &LateContext<'a, 'b>) -> bool {
-    let parent_id = cx.tcx.hir().get_parent_node(expr.hir_id);
-    let parent_node = cx.tcx.hir().get(parent_id);
+    let map = cx.tcx.hir();
+    let parent_id = map.get_parent_node(expr.hir_id);
+    let parent_node = map.get(parent_id);
 
     match parent_node {
-        rustc::hir::Node::Expr(e) => higher::if_block(&e).is_some(),
-        rustc::hir::Node::Arm(e) => higher::if_block(&e.body).is_some(),
+        Node::Expr(e) => higher::if_block(&e).is_some(),
+        Node::Arm(e) => higher::if_block(&e.body).is_some(),
         _ => false,
     }
 }

clippy_workspace_tests/src/main.rs

@@ -1,4 +1,3 @@
 #![deny(rust_2018_idioms)]
 
-fn main() {
-}
+fn main() {}

clippy_workspace_tests/subcrate/src/lib.rs

@@ -0,0 +1 @@
+

tests/fmt.rs

@@ -1,3 +1,4 @@
+use std::path::PathBuf;
 use std::process::Command;
 
 #[test]
@@ -17,7 +18,7 @@ fn fmt() {
         return;
     }
 
-    let root_dir = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"));
+    let root_dir = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
     let dev_dir = root_dir.join("clippy_dev");
     let target_dir = root_dir.join("target");
     let target_dir = target_dir.to_str().unwrap();