rust vs cpp diff

vec.cpp

// clang++ -S -std=c++11 -emit-llvm -vec.cpp -o vec_cpp.ll
// lines: 891
// ( wc -l vec_cpp.ll )
// with stripped blank lines and comments:
// ( sed '/^\s*;/d;/^\s*$/d' vec_cpp.ll | wc -l )
// 698

#include <cinttypes>
#include <vector>

int main(int, char* []) {
    auto v = std::vector<int32_t>(0, 100);
    for (auto n : v) {
    }
}

vec.rs

// rustc +nightly --emit llvm-ir vec.rs -o vec_rust.ll
// lines: 4634
// ( wc -l vec_rust.ll )
// with stripped blank lines and comments:
// ( sed '/^\s*;/d;/^\s*$/d' vec_rust.ll | wc -l )
// 3523

fn main() {
    let v = vec![0i32;100];
    for n in v {

    }
}