Static rustc_lint::drop_forget_useless::DROPPING_COPY_TYPES

pub static DROPPING_COPY_TYPES: &Lint

The dropping_copy_types lint checks for calls to std::mem::drop with a value that derives the Copy trait.

Example

let x: i32 = 42; // i32 implements Copy
std::mem::drop(x); // A copy of x is passed to the function, leaving the
                   // original unaffected

{{produces}}

Explanation

Calling std::mem::drop does nothing for types that implement Copy, since the value will be copied and moved into the function on invocation.