mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-12-05 02:50:32 +00:00
206 lines
3.7 KiB
Rust
206 lines
3.7 KiB
Rust
fn fn_val(i: i32) -> i32 {
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unimplemented!()
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}
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fn fn_constref(i: &i32) -> i32 {
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unimplemented!()
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}
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fn fn_mutref(i: &mut i32) {
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unimplemented!()
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}
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fn fooi() -> i32 {
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unimplemented!()
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}
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fn foob() -> bool {
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unimplemented!()
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}
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#[allow(clippy::many_single_char_names)]
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fn immutable_condition() {
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// Should warn when all vars mentioned are immutable
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let y = 0;
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while y < 10 {
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println!("KO - y is immutable");
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}
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let x = 0;
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while y < 10 && x < 3 {
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let mut k = 1;
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k += 2;
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println!("KO - x and y immutable");
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}
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let cond = false;
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while !cond {
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println!("KO - cond immutable");
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}
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let mut i = 0;
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while y < 10 && i < 3 {
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i += 1;
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println!("OK - i is mutable");
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}
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let mut mut_cond = false;
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while !mut_cond || cond {
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mut_cond = true;
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println!("OK - mut_cond is mutable");
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}
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while fooi() < x {
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println!("OK - Fn call results may vary");
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}
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while foob() {
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println!("OK - Fn call results may vary");
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}
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let mut a = 0;
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let mut c = move || {
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while a < 5 {
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a += 1;
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println!("OK - a is mutable");
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}
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};
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c();
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let mut tup = (0, 0);
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while tup.0 < 5 {
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tup.0 += 1;
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println!("OK - tup.0 gets mutated")
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}
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}
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fn unused_var() {
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// Should warn when a (mutable) var is not used in while body
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let (mut i, mut j) = (0, 0);
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while i < 3 {
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j = 3;
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println!("KO - i not mentioned");
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}
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while i < 3 && j > 0 {
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println!("KO - i and j not mentioned");
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}
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while i < 3 {
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let mut i = 5;
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fn_mutref(&mut i);
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println!("KO - shadowed");
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}
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while i < 3 && j > 0 {
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i = 5;
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println!("OK - i in cond and mentioned");
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}
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}
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fn used_immutable() {
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let mut i = 0;
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while i < 3 {
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fn_constref(&i);
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println!("KO - const reference");
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}
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while i < 3 {
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fn_val(i);
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println!("KO - passed by value");
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}
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while i < 3 {
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println!("OK - passed by mutable reference");
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fn_mutref(&mut i)
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}
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while i < 3 {
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fn_mutref(&mut i);
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println!("OK - passed by mutable reference");
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}
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}
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const N: i32 = 5;
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const B: bool = false;
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fn consts() {
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while false {
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println!("Constants are not linted");
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}
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while B {
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println!("Constants are not linted");
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}
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while N > 0 {
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println!("Constants are not linted");
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}
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}
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use std::cell::Cell;
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fn maybe_i_mutate(i: &Cell<bool>) {
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unimplemented!()
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}
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fn internally_mutable() {
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let b = Cell::new(true);
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while b.get() {
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// b cannot be silently coerced to `bool`
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maybe_i_mutate(&b);
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println!("OK - Method call within condition");
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}
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}
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struct Counter {
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count: usize,
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}
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impl Counter {
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fn inc(&mut self) {
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self.count += 1;
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}
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fn inc_n(&mut self, n: usize) {
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while self.count < n {
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self.inc();
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}
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println!("OK - self borrowed mutably");
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}
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fn print_n(&self, n: usize) {
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while self.count < n {
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println!("KO - {} is not mutated", self.count);
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}
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}
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}
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fn while_loop_with_break_and_return() {
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let y = 0;
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while y < 10 {
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if y == 0 {
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break;
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}
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println!("KO - loop contains break");
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}
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while y < 10 {
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if y == 0 {
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return;
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}
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println!("KO - loop contains return");
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}
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}
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fn main() {
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immutable_condition();
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unused_var();
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used_immutable();
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internally_mutable();
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let mut c = Counter { count: 0 };
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c.inc_n(5);
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c.print_n(2);
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while_loop_with_break_and_return();
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}
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