Cargo Crashes with Consecutive Cleaning & Compiling

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Hi all,

I've been trying to use cargo programmatically to clean the project in the current directory without removing build artefacts of dependencies, then compile it. Unfortunately, it looks like I can't do both at the same time:

extern crate cargo;

use cargo::ops::{CompileOptions, CleanOptions, Packages, CompileFilter, MessageFormat, CompileMode};
use cargo::core::Workspace;
use cargo::core::shell::Verbosity;
use cargo::util::config::Config;
use std::env::current_dir;

fn main() {
    let rustc_opts = {
        let mut opts = vec!("--emit", "asm", "-C", "debuginfo=2");
        opts
    }.iter().map(|s| (*s).into()).collect::<Vec<String>>();

    let conf = {
        let mut conf = Config::default().unwrap();
        conf.shell().set_verbosity(Verbosity::Verbose);
        conf
    };

    let ws = Workspace::new(&current_dir().unwrap().join("Cargo.toml"), &conf).unwrap();

    cargo::ops::clean(&ws, &CleanOptions {
        spec: &["NAME OF PROJECT FROM CARGO.TOML HERE".into()],
        target: None,
        config: &conf,
        release: false
    }).unwrap();

    let compilation = cargo::ops::compile(&ws, &CompileOptions {
        config: &conf,
        jobs: None,
        target: None,
        features: &[],
        all_features: false,
        no_default_features: false,
        spec: Packages::All,
        release: false,
        filter: CompileFilter::Default { required_features_filterable: true },
        mode: CompileMode::Build,
        message_format: MessageFormat::Human,
        target_rustdoc_args: None,
        target_rustc_args: Some(&rustc_opts)
    }).expect("it crashes here");
}

Cleaning the project without compiling it works, as does compiling without cleaning. The error is

'couldn't get the path to cargo executable', Os { code: 2, kind: NotFound, message: "No such file or directory" }

I've tried a few permutations of settings, workspaces, etc, but there's a lot of surface area to cover. It also fails if I try to clean the entire project as well (spec: &[] in CleanOptions). Am I missing something here?