| //! Test for #145784 as it relates to format arguments: arguments to macros such as `println!` |
| //! should obey normal temporary scoping rules. |
| //@ revisions: e2021 e2024 |
| //@ [e2021] check-pass |
| //@ [e2021] edition: 2021 |
| //@ [e2024] edition: 2024 |
| |
| fn temp() {} |
| |
| fn main() { |
| // In Rust 2024, block tail expressions are temporary scopes, so the result of `temp()` is |
| // dropped after evaluating `&temp()`. |
| println!("{:?}", { &temp() }); |
| //[e2024]~^ ERROR: temporary value dropped while borrowed [E0716] |
| |
| // In Rust 1.89, `format_args!` extended the lifetime of all extending expressions in its |
| // arguments when provided with two or more arguments. This caused the result of `temp()` to |
| // outlive the result of the block, making this compile. |
| println!("{:?}{:?}", { &temp() }, ()); |
| //[e2024]~^ ERROR: temporary value dropped while borrowed [E0716] |
| } |
