rust/tests/ui/codegen/output-slot-init-vs-noninit.rs

//! Check that output slots work correctly for both initializing and non-initializing assignments.
//!
//! Regression test for <https://github.com/rust-lang/rust/issues/24>.

//@ run-pass

#![allow(dead_code)]
#![allow(unused_assignments)]
#![allow(unknown_lints)]
#![allow(dead_assignment)]
#![allow(unused_variables)]

struct A {
    a: isize,
    b: isize,
}

struct Abox {
    a: Box<isize>,
    b: Box<isize>,
}

fn ret_int_i() -> isize {
    10
}

fn ret_ext_i() -> Box<isize> {
    Box::new(10)
}

fn ret_int_rec() -> A {
    A { a: 10, b: 10 }
}

fn ret_ext_rec() -> Box<A> {
    Box::new(A { a: 10, b: 10 })
}

fn ret_ext_mem() -> Abox {
    Abox { a: Box::new(10), b: Box::new(10) }
}

fn ret_ext_ext_mem() -> Box<Abox> {
    Box::new(Abox { a: Box::new(10), b: Box::new(10) })
}

pub fn main() {
    let mut int_i: isize;
    let mut ext_i: Box<isize>;
    let mut int_rec: A;
    let mut ext_rec: Box<A>;
    let mut ext_mem: Abox;
    let mut ext_ext_mem: Box<Abox>;

    int_i = ret_int_i(); // initializing
    int_i = ret_int_i(); // non-initializing
    int_i = ret_int_i(); // non-initializing

    ext_i = ret_ext_i(); // initializing
    ext_i = ret_ext_i(); // non-initializing
    ext_i = ret_ext_i(); // non-initializing

    int_rec = ret_int_rec(); // initializing
    int_rec = ret_int_rec(); // non-initializing
    int_rec = ret_int_rec(); // non-initializing

    ext_rec = ret_ext_rec(); // initializing
    ext_rec = ret_ext_rec(); // non-initializing
    ext_rec = ret_ext_rec(); // non-initializing

    ext_mem = ret_ext_mem(); // initializing
    ext_mem = ret_ext_mem(); // non-initializing
    ext_mem = ret_ext_mem(); // non-initializing

    ext_ext_mem = ret_ext_ext_mem(); // initializing
    ext_ext_mem = ret_ext_ext_mem(); // non-initializing
    ext_ext_mem = ret_ext_ext_mem(); // non-initializing
}