rust/tests/ui/no_effect.rs
2017-10-07 23:32:09 +01:00

125 lines
2.4 KiB
Rust

#![feature(plugin, box_syntax, inclusive_range_syntax)]
#![warn(no_effect, unnecessary_operation)]
#![allow(dead_code)]
#![allow(path_statements)]
#![allow(deref_addrof)]
#![feature(untagged_unions)]
struct Unit;
struct Tuple(i32);
struct Struct {
field: i32
}
enum Enum {
Tuple(i32),
Struct { field: i32 },
}
struct DropUnit;
impl Drop for DropUnit {
fn drop(&mut self) {}
}
struct DropStruct {
field: i32
}
impl Drop for DropStruct {
fn drop(&mut self) {}
}
struct DropTuple(i32);
impl Drop for DropTuple {
fn drop(&mut self) {}
}
enum DropEnum {
Tuple(i32),
Struct { field: i32 },
}
impl Drop for DropEnum {
fn drop(&mut self) {}
}
struct FooString {
s: String,
}
union Union {
a: u8,
b: f64,
}
fn get_number() -> i32 { 0 }
fn get_struct() -> Struct { Struct { field: 0 } }
fn get_drop_struct() -> DropStruct { DropStruct { field: 0 } }
unsafe fn unsafe_fn() -> i32 { 0 }
fn main() {
let s = get_struct();
let s2 = get_struct();
0;
s2;
Unit;
Tuple(0);
Struct { field: 0 };
Struct { ..s };
Union { a: 0 };
Enum::Tuple(0);
Enum::Struct { field: 0 };
5 + 6;
*&42;
&6;
(5, 6, 7);
box 42;
..;
5..;
..5;
5..6;
5..=6;
[42, 55];
[42, 55][1];
(42, 55).1;
[42; 55];
[42; 55][13];
let mut x = 0;
|| x += 5;
let s: String = "foo".into();
FooString { s: s };
// Do not warn
get_number();
unsafe { unsafe_fn() };
DropUnit;
DropStruct { field: 0 };
DropTuple(0);
DropEnum::Tuple(0);
DropEnum::Struct { field: 0 };
Tuple(get_number());
Struct { field: get_number() };
Struct { ..get_struct() };
Enum::Tuple(get_number());
Enum::Struct { field: get_number() };
5 + get_number();
*&get_number();
&get_number();
(5, 6, get_number());
box get_number();
get_number()..;
..get_number();
5..get_number();
[42, get_number()];
[42, 55][get_number() as usize];
(42, get_number()).1;
[get_number(); 55];
[42; 55][get_number() as usize];
{get_number()};
FooString { s: String::from("blah"), };
// Do not warn
DropTuple(get_number());
DropStruct { field: get_number() };
DropStruct { field: get_number() };
DropStruct { ..get_drop_struct() };
DropEnum::Tuple(get_number());
DropEnum::Struct { field: get_number() };
}