tests/codegen-llvm/issues/issue-103840.rs

//@ compile-flags: -Copt-level=3
#![crate_type = "lib"]

pub fn foo(t: &mut Vec<usize>) {
    // CHECK-NOT: __rust_dealloc
    let mut taken = std::mem::take(t);
    taken.pop();
    *t = taken;
}