142 lines
2.4 KiB
Rust
142 lines
2.4 KiB
Rust
#![warn(unused)]
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#![deny(unused_variables)]
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#![deny(unused_assignments)]
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#![allow(dead_code, non_camel_case_types, trivial_numeric_casts)]
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use std::ops::AddAssign;
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fn f1(x: isize) {
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//~^ ERROR unused variable: `x`
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}
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fn f1b(x: &mut isize) {
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//~^ ERROR unused variable: `x`
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}
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#[allow(unused_variables)]
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fn f1c(x: isize) {}
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fn f1d() {
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let x: isize;
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//~^ ERROR unused variable: `x`
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}
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fn f2() {
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let x = 3;
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//~^ ERROR unused variable: `x`
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}
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fn f3() {
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let mut x = 3;
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//~^ ERROR variable `x` is assigned to, but never used
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x += 4;
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//~^ ERROR value assigned to `x` is never read
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}
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fn f3b() {
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let mut z = 3;
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//~^ ERROR variable `z` is assigned to, but never used
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loop {
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z += 4;
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}
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}
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#[allow(unused_variables)]
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fn f3c() {
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let mut z = 3;
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loop { z += 4; }
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}
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#[allow(unused_variables)]
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#[allow(unused_assignments)]
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fn f3d() {
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let mut x = 3;
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x += 4;
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}
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fn f4() {
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match Some(3) {
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Some(i) => {
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//~^ ERROR unused variable: `i`
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}
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None => {}
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}
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}
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enum tri {
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a(isize), b(isize), c(isize)
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}
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fn f4b() -> isize {
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match tri::a(3) {
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tri::a(i) | tri::b(i) | tri::c(i) => {
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i
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}
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}
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}
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fn f5a() {
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for x in 1..10 { }
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//~^ ERROR unused variable: `x`
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}
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fn f5b() {
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for (x, _) in [1, 2, 3].iter().enumerate() { }
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//~^ ERROR unused variable: `x`
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}
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fn f5c() {
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for (_, x) in [1, 2, 3].iter().enumerate() {
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//~^ ERROR unused variable: `x`
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continue;
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drop(*x as i32); //~ WARNING unreachable statement
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}
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}
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struct View<'a>(&'a mut [i32]);
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impl<'a> AddAssign<i32> for View<'a> {
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fn add_assign(&mut self, rhs: i32) {
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for lhs in self.0.iter_mut() {
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*lhs += rhs;
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}
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}
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}
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fn f6() {
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let mut array = [1, 2, 3];
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let mut v = View(&mut array);
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// ensure an error shows up for x even if lhs of an overloaded add assign
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let x;
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//~^ ERROR variable `x` is assigned to, but never used
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*({
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x = 0; //~ ERROR value assigned to `x` is never read
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&mut v
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}) += 1;
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}
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struct MutRef<'a>(&'a mut i32);
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impl<'a> AddAssign<i32> for MutRef<'a> {
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fn add_assign(&mut self, rhs: i32) {
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*self.0 += rhs;
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}
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}
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fn f7() {
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let mut a = 1;
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{
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// `b` does not trigger unused_variables
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let mut b = MutRef(&mut a);
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b += 1;
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}
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drop(a);
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}
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fn main() {
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}
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