mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-09-20 22:51:58 +00:00
51 lines
1.6 KiB
Rust
51 lines
1.6 KiB
Rust
|
#![feature(plugin)]
|
||
|
|
#![plugin(clippy)]
|
||
|
|
|
||
|
|
#[deny(eval_order_dependence)]
|
||
|
|
#[allow(unused_assignments, unused_variables, many_single_char_names, no_effect, dead_code, blacklisted_name)]
|
||
|
|
fn main() {
|
||
|
|
let mut x = 0;
|
||
|
|
let a = { x = 1; 1 } + x;
|
||
|
|
//~^ ERROR unsequenced read
|
||
|
|
|
||
|
|
// Example from iss#277
|
||
|
|
x += { x = 20; 2 }; //~ERROR unsequenced read
|
||
|
|
|
||
|
|
// Does it work in weird places?
|
||
|
|
// ...in the base for a struct expression?
|
||
|
|
struct Foo { a: i32, b: i32 };
|
||
|
|
let base = Foo { a: 4, b: 5 };
|
||
|
|
let foo = Foo { a: x, .. { x = 6; base } };
|
||
|
|
//~^ ERROR unsequenced read
|
||
|
|
// ...inside a closure?
|
||
|
|
let closure = || {
|
||
|
|
let mut x = 0;
|
||
|
|
x += { x = 20; 2 }; //~ERROR unsequenced read
|
||
|
|
};
|
||
|
|
// ...not across a closure?
|
||
|
|
let mut y = 0;
|
||
|
|
let b = (y, || { y = 1 });
|
||
|
|
|
||
|
|
// && and || evaluate left-to-right.
|
||
|
|
let a = { x = 1; true } && (x == 3);
|
||
|
|
let a = { x = 1; true } || (x == 3);
|
||
|
|
|
||
|
|
// Make sure we don't get confused by alpha conversion.
|
||
|
|
let a = { let mut x = 1; x = 2; 1 } + x;
|
||
|
|
|
||
|
|
// No warning if we don't read the variable...
|
||
|
|
x = { x = 20; 2 };
|
||
|
|
// ...if the assignment is in a closure...
|
||
|
|
let b = { || { x = 1; }; 1 } + x;
|
||
|
|
// ... or the access is under an address.
|
||
|
|
let b = ({ let p = &x; 1 }, { x = 1; x });
|
||
|
|
|
||
|
|
// Limitation: l-values other than simple variables don't trigger
|
||
|
|
// the warning.
|
||
|
|
let mut tup = (0, 0);
|
||
|
|
let c = { tup.0 = 1; 1 } + tup.0;
|
||
|
|
// Limitation: you can get away with a read under address-of.
|
||
|
|
let mut z = 0;
|
||
|
|
let b = (&{ z = x; x }, { x = 3; x });
|
||
|
|
}
|