rust/tests/compile-fail/escape_analysis.rs
2016-02-01 20:37:07 +01:00

106 lines
1.6 KiB
Rust

#![feature(plugin, box_syntax)]
#![plugin(clippy)]
#![allow(warnings, clippy)]
#![deny(boxed_local)]
#[derive(Clone)]
struct A;
impl A {
fn foo(&self){}
}
trait Z {
fn bar(&self);
}
impl Z for A {
fn bar(&self) {
//nothing
}
}
fn main() {
}
fn ok_box_trait(boxed_trait: &Box<Z>) {
let boxed_local = boxed_trait;
// done
}
fn warn_call() {
let x = box A; //~ ERROR local variable
x.foo();
}
fn warn_arg(x: Box<A>) { //~ ERROR local variable
x.foo();
}
fn nowarn_closure_arg() {
let x = Some(box A);
x.map_or((), |x| take_ref(&x));
}
fn warn_rename_call() {
let x = box A;
let y = x; //~ ERROR local variable
y.foo(); // via autoderef
}
fn warn_notuse() {
let bz = box A; //~ ERROR local variable
}
fn warn_pass() {
let bz = box A; //~ ERROR local variable
take_ref(&bz); // via deref coercion
}
fn nowarn_return() -> Box<A> {
let fx = box A;
fx // moved out, "escapes"
}
fn nowarn_move() {
let bx = box A;
drop(bx) // moved in, "escapes"
}
fn nowarn_call() {
let bx = box A;
bx.clone(); // method only available to Box, not via autoderef
}
fn nowarn_pass() {
let bx = box A;
take_box(&bx); // fn needs &Box
}
fn take_box(x: &Box<A>) {}
fn take_ref(x: &A) {}
fn nowarn_ref_take() {
// false positive, should actually warn
let x = box A; //~ ERROR local variable
let y = &x;
take_box(y);
}
fn nowarn_match() {
let x = box A; // moved into a match
match x {
y => drop(y)
}
}
fn warn_match() {
let x = box A; //~ ERROR local variable
match &x { // not moved
ref y => ()
}
}