pub const extern "rust-intrinsic" fn needs_drop<T>() -> bool
Returns true if the actual type given as T requires drop glue; returns false if the actual type provided for T implements Copy.
If the actual type neither requires drop glue nor implements Copy, then the return value of this function is unspecified.
The stabilized version of this intrinsic is needs_drop.
© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/intrinsics/fn.needs_drop.html