Rust errors / Everything else
Rust compiler error · checked with rustc 1.99.0
Rust error E0040: explicit use of destructor method
What it meansIt is not allowed to manually call destructors in Rust.
What rustc prints
error[E0040]: explicit use of destructor method --> main.rs:13:7 | 13 | x.drop(); // error: explicit use of destructor method | ^^^^ explicit destructor calls not allowed | help: consider using `drop` function | 13 - x.drop(); // error: explicit use of destructor method 13 + drop(x); // error: explicit use of destructor method |
Real output of rustc 1.99.0 compiling the official example below (2021 edition). Your names and line numbers will differ; the first line is the part to match.
E0040Everything else
Activein rustc 1.99.0
6related errors linked below
The compiler team's explanation
It is not allowed to manually call destructors in Rust.
Erroneous code example:
struct Foo {
x: i32,
}
impl Drop for Foo {
fn drop(&mut self) {
println!("kaboom");
}
}
fn main() {
let mut x = Foo { x: -7 };
x.drop(); // error: explicit use of destructor method
}It is unnecessary to do this since drop is called automatically whenever a value goes out of scope. However, if you really need to drop a value by hand, you can use the std::mem::drop function:
struct Foo {
x: i32,
}
impl Drop for Foo {
fn drop(&mut self) {
println!("kaboom");
}
}
fn main() {
let mut x = Foo { x: -7 };
drop(x); // ok!
}From rustc --explain E0040 (1.99.0), part of the Rust project, MIT or Apache-2.0. Official page.
Related errors
- E0061this function takes N arguments but M were supplied
- E0412cannot find type in this scope
- E0515cannot return reference to local variable
- E0728await is only allowed inside async functions and blocks
- E0045C-variadic functions with the "Rust" calling convention are not supported
- E0054cannot cast `i32` as `bool`
Up next
Often hit nextE0061: this function takes N arguments but M were suppliedA related error from the same family.Read it next →Did this answer your question?