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|
// Issue #29793, small regression tests: do not let borrows of
// parameters to ever be returned (expanded with exploration of
// variations).
// CLOSURES
fn escaping_borrow_of_closure_params_1() {
let g = |x: usize, y:usize| {
let f = |t: bool| if t { x } else { y }; // (separate errors for `x` vs `y`)
//~^ ERROR E0373
//~| ERROR E0373
return f;
};
// We delberately do not call `g`; this small version of the test,
// after adding such a call, was (properly) rejected even when the
// system still suffered from issue #29793.
// g(10, 20)(true);
}
fn escaping_borrow_of_closure_params_2() {
let g = |x: usize, y:usize| {
let f = |t: bool| if t { x } else { y }; // (separate errors for `x` vs `y`)
//~^ ERROR E0373
//~| ERROR E0373
f
};
// (we don't call `g`; see above)
}
fn move_of_closure_params() {
let g = |x: usize, y:usize| {
let f = move |t: bool| if t { x } else { y };
f;
};
// (this code is fine, so lets go ahead and ensure rustc accepts call of `g`)
(g(1,2));
}
fn ok_borrow_of_fn_params(a: usize, b:usize) {
let g = |x: usize, y:usize| {
let f = |t: bool| if t { a } else { b };
return f;
};
// (this code is fine, so lets go ahead and ensure rustc accepts call of `g`)
(g(1,2))(true);
}
// TOP-LEVEL FN'S
fn escaping_borrow_of_fn_params_1() {
fn g<'a>(x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a> {
let f = |t: bool| if t { x } else { y }; // (separate errors for `x` vs `y`)
//~^ ERROR E0373
//~| ERROR E0373
return Box::new(f);
};
// (we don't call `g`; see above)
}
fn escaping_borrow_of_fn_params_2() {
fn g<'a>(x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a> {
let f = |t: bool| if t { x } else { y }; // (separate errors for `x` vs `y`)
//~^ ERROR E0373
//~| ERROR E0373
Box::new(f)
};
// (we don't call `g`; see above)
}
fn move_of_fn_params() {
fn g<'a>(x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a> {
let f = move |t: bool| if t { x } else { y };
return Box::new(f);
};
// (this code is fine, so lets go ahead and ensure rustc accepts call of `g`)
(g(1,2))(true);
}
// INHERENT METHODS
fn escaping_borrow_of_method_params_1() {
struct S;
impl S {
fn g<'a>(&self, x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a> {
let f = |t: bool| if t { x } else { y }; // (separate errors for `x` vs `y`)
//~^ ERROR E0373
//~| ERROR E0373
return Box::new(f);
}
}
// (we don't call `g`; see above)
}
fn escaping_borrow_of_method_params_2() {
struct S;
impl S {
fn g<'a>(&self, x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a> {
let f = |t: bool| if t { x } else { y }; // (separate errors for `x` vs `y`)
//~^ ERROR E0373
//~| ERROR E0373
Box::new(f)
}
}
// (we don't call `g`; see above)
}
fn move_of_method_params() {
struct S;
impl S {
fn g<'a>(&self, x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a> {
let f = move |t: bool| if t { x } else { y };
return Box::new(f);
}
}
// (this code is fine, so lets go ahead and ensure rustc accepts call of `g`)
(S.g(1,2))(true);
}
// TRAIT IMPL METHODS
fn escaping_borrow_of_trait_impl_params_1() {
trait T { fn g<'a>(&self, x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a>; }
struct S;
impl T for S {
fn g<'a>(&self, x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a> {
let f = |t: bool| if t { x } else { y }; // (separate errors for `x` vs `y`)
//~^ ERROR E0373
//~| ERROR E0373
return Box::new(f);
}
}
// (we don't call `g`; see above)
}
fn escaping_borrow_of_trait_impl_params_2() {
trait T { fn g<'a>(&self, x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a>; }
struct S;
impl T for S {
fn g<'a>(&self, x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a> {
let f = |t: bool| if t { x } else { y }; // (separate errors for `x` vs `y`)
//~^ ERROR E0373
//~| ERROR E0373
Box::new(f)
}
}
// (we don't call `g`; see above)
}
fn move_of_trait_impl_params() {
trait T { fn g<'a>(&self, x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a>; }
struct S;
impl T for S {
fn g<'a>(&self, x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a> {
let f = move |t: bool| if t { x } else { y };
return Box::new(f);
}
}
// (this code is fine, so lets go ahead and ensure rustc accepts call of `g`)
(S.g(1,2))(true);
}
// TRAIT DEFAULT METHODS
fn escaping_borrow_of_trait_default_params_1() {
struct S;
trait T {
fn g<'a>(&self, x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a> {
let f = |t: bool| if t { x } else { y }; // (separate errors for `x` vs `y`)
//~^ ERROR E0373
//~| ERROR E0373
return Box::new(f);
}
}
impl T for S {}
// (we don't call `g`; see above)
}
fn escaping_borrow_of_trait_default_params_2() {
struct S;
trait T {
fn g<'a>(&self, x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a> {
let f = |t: bool| if t { x } else { y }; // (separate errors for `x` vs `y`)
//~^ ERROR E0373
//~| ERROR E0373
Box::new(f)
}
}
impl T for S {}
// (we don't call `g`; see above)
}
fn move_of_trait_default_params() {
struct S;
trait T {
fn g<'a>(&self, x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a> {
let f = move |t: bool| if t { x } else { y };
return Box::new(f);
}
}
impl T for S {}
// (this code is fine, so lets go ahead and ensure rustc accepts call of `g`)
(S.g(1,2))(true);
}
fn main() { }
|
