2021-04-22 09:31:13 +00:00
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// run-rustfix
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#![allow(unused, clippy::needless_pass_by_value, clippy::collapsible_if)]
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#![warn(clippy::map_entry)]
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#![feature(asm)]
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2021-09-08 14:31:47 +00:00
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use std::collections::HashMap;
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2021-04-22 09:31:13 +00:00
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use std::hash::Hash;
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macro_rules! m {
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($e:expr) => {{ $e }};
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}
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macro_rules! insert {
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($map:expr, $key:expr, $val:expr) => {
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$map.insert($key, $val)
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};
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}
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fn foo() {}
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fn hash_map<K: Eq + Hash + Copy, V: Copy>(m: &mut HashMap<K, V>, m2: &mut HashMap<K, V>, k: K, k2: K, v: V, v2: V) {
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// or_insert(v)
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if !m.contains_key(&k) {
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m.insert(k, v);
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}
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// semicolon on insert, use or_insert_with(..)
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if !m.contains_key(&k) {
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if true {
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m.insert(k, v);
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} else {
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m.insert(k, v2);
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}
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}
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// semicolon on if, use or_insert_with(..)
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if !m.contains_key(&k) {
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if true {
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m.insert(k, v)
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} else {
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m.insert(k, v2)
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};
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}
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// early return, use if let
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if !m.contains_key(&k) {
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if true {
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m.insert(k, v);
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} else {
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m.insert(k, v2);
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return;
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}
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}
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// use or_insert_with(..)
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if !m.contains_key(&k) {
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foo();
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m.insert(k, v);
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}
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// semicolon on insert and match, use or_insert_with(..)
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if !m.contains_key(&k) {
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match 0 {
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1 if true => {
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m.insert(k, v);
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},
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_ => {
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m.insert(k, v2);
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},
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};
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}
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// one branch doesn't insert, use if let
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if !m.contains_key(&k) {
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match 0 {
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0 => foo(),
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_ => {
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m.insert(k, v2);
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},
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};
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}
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// use or_insert_with
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if !m.contains_key(&k) {
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foo();
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match 0 {
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0 if false => {
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m.insert(k, v);
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},
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1 => {
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foo();
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m.insert(k, v);
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},
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2 | 3 => {
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for _ in 0..2 {
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foo();
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}
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if true {
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m.insert(k, v);
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} else {
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m.insert(k, v2);
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};
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},
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_ => {
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m.insert(k, v2);
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},
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}
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}
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// ok, insert in loop
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if !m.contains_key(&k) {
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for _ in 0..2 {
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m.insert(k, v);
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}
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}
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// macro_expansion test, use or_insert(..)
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if !m.contains_key(&m!(k)) {
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m.insert(m!(k), m!(v));
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}
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// ok, map used before insertion
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if !m.contains_key(&k) {
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let _ = m.len();
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m.insert(k, v);
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}
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// ok, inline asm
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if !m.contains_key(&k) {
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unsafe { asm!("nop") }
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m.insert(k, v);
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}
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// ok, different keys.
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if !m.contains_key(&k) {
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m.insert(k2, v);
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}
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// ok, different maps
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if !m.contains_key(&k) {
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m2.insert(k, v);
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}
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// ok, insert in macro
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if !m.contains_key(&k) {
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insert!(m, k, v);
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}
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2021-09-08 14:31:47 +00:00
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// or_insert_with. Partial move of a local declared in the closure is ok.
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2021-04-22 09:31:13 +00:00
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if !m.contains_key(&k) {
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2021-09-08 14:31:47 +00:00
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let x = (String::new(), String::new());
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let _ = x.0;
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2021-04-22 09:31:13 +00:00
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m.insert(k, v);
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}
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}
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fn main() {}
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