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#![allow(unused)]
#![deny(dangling_pointers_from_temporaries)]
fn string() -> String {
"hello".into()
}
struct Wrapper(String);
fn main() {
// ConstBlock
const { String::new() }.as_ptr();
// Array
{
[string()].as_ptr(); // False negative
[true].as_ptr();
}
// Call
string().as_ptr();
//~^ ERROR a dangling pointer will be produced because the temporary `String` will be dropped
// MethodCall
"hello".to_string().as_ptr();
//~^ ERROR a dangling pointer will be produced because the temporary `String` will be dropped
// Tup
// impossible
// Binary
(string() + "hello").as_ptr();
//~^ ERROR a dangling pointer will be produced because the temporary `String` will be dropped
// Path
{
let x = string();
x.as_ptr();
}
// Unary
{
let x = string();
let x: &String = &x;
(*x).as_ptr();
(&[0u8]).as_ptr();
(&string()).as_ptr(); // False negative
(*&string()).as_ptr(); // False negative
}
// Lit
"hello".as_ptr();
// Cast
// impossible
// Type
// impossible
// DropTemps
// impossible
// Let
// impossible
// If
{
(if true { String::new() } else { "hello".into() }).as_ptr();
//~^ ERROR a dangling pointer will be produced because the temporary `String` will be dropped
}
// Loop
{
(loop {
break String::new();
})
.as_ptr();
//~^ ERROR a dangling pointer will be produced because the temporary `String` will be dropped
}
// Match
{
match string() {
s => s,
}
.as_ptr();
//~^ ERROR a dangling pointer will be produced because the temporary `String` will be dropped
}
// Closure
// impossible
// Block
{ string() }.as_ptr();
//~^ ERROR a dangling pointer will be produced because the temporary `String` will be dropped
// Assign, AssignOp
// impossible
// Field
{
Wrapper(string()).0.as_ptr(); // False negative
let x = Wrapper(string());
x.0.as_ptr();
}
// Index
{
vec![string()][0].as_ptr(); // False negative
let x = vec![string()];
x[0].as_ptr();
}
// AddrOf, InlineAsm, OffsetOf
// impossible
// Break, Continue, Ret
// are !
// Become, Yield
// unstable, are !
// Repeat
[0u8; 100].as_ptr();
[const { String::new() }; 100].as_ptr();
// Struct
// Cannot test this without access to private fields of the linted types.
// Err
// impossible
// Macro
vec![0u8].as_ptr();
//~^ ERROR a dangling pointer will be produced because the temporary `Vec<u8>` will be dropped
}
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