src/test/ui/check-static-values-constraints.rs

// Verifies all possible restrictions for statics values.

#![allow(warnings)]
#![feature(box_syntax)]

use std::marker;

struct WithDtor;

impl Drop for WithDtor {
    fn drop(&mut self) {}
}

// This enum will be used to test the following rules:
// 1. Variants are safe for static
// 2. Expr calls are allowed as long as they arguments are safe
// 3. Expr calls with unsafe arguments for statics are rejected
enum SafeEnum {
    Variant1,
    Variant2(isize),
    Variant3(WithDtor),
    Variant4(String)
}

// These should be ok
static STATIC1: SafeEnum = SafeEnum::Variant1;
static STATIC2: SafeEnum = SafeEnum::Variant2(0);
static STATIC3: SafeEnum = SafeEnum::Variant3(WithDtor);

enum UnsafeEnum {
    Variant5,
    Variant6(isize)
}

impl Drop for UnsafeEnum {
    fn drop(&mut self) {}
}


static STATIC4: UnsafeEnum = UnsafeEnum::Variant5;
static STATIC5: UnsafeEnum = UnsafeEnum::Variant6(0);


struct SafeStruct {
    field1: SafeEnum,
    field2: SafeEnum,
}


// Struct fields are safe, hence this static should be safe
static STATIC6: SafeStruct = SafeStruct{field1: SafeEnum::Variant1, field2: SafeEnum::Variant2(0)};

static STATIC7: SafeStruct = SafeStruct{field1: SafeEnum::Variant1,
                                        field2: SafeEnum::Variant3(WithDtor)};

// Test variadic constructor for structs. The base struct should be examined
// as well as every field present in the constructor.
// This example shouldn't fail because all the fields are safe.
static STATIC8: SafeStruct = SafeStruct{field1: SafeEnum::Variant1,
                                        ..SafeStruct{field1: SafeEnum::Variant1,
                                                     field2: SafeEnum::Variant1}};

// This example should fail because field1 in the base struct is not safe
static STATIC9: SafeStruct = SafeStruct{field1: SafeEnum::Variant1,
                                        ..SafeStruct{field1: SafeEnum::Variant3(WithDtor),
//~^ ERROR destructors cannot be evaluated at compile-time
                                                     field2: SafeEnum::Variant1}};

struct UnsafeStruct;

impl Drop for UnsafeStruct {
    fn drop(&mut self) {}
}

static STATIC10: UnsafeStruct = UnsafeStruct;

struct MyOwned;

static STATIC11: Box<MyOwned> = box MyOwned;
//~^ ERROR allocations are not allowed in statics

static mut STATIC12: UnsafeStruct = UnsafeStruct;

static mut STATIC13: SafeStruct = SafeStruct{field1: SafeEnum::Variant1,
                                             field2: SafeEnum::Variant3(WithDtor)};

static mut STATIC14: SafeStruct = SafeStruct {
    field1: SafeEnum::Variant1,
    field2: SafeEnum::Variant4("str".to_string())
//~^ ERROR calls in statics are limited to constant functions
};

static STATIC15: &'static [Box<MyOwned>] = &[
    box MyOwned, //~ ERROR allocations are not allowed in statics
    box MyOwned, //~ ERROR allocations are not allowed in statics
];

static STATIC16: (&'static Box<MyOwned>, &'static Box<MyOwned>) = (
    &box MyOwned, //~ ERROR allocations are not allowed in statics
    &box MyOwned, //~ ERROR allocations are not allowed in statics
);

static mut STATIC17: SafeEnum = SafeEnum::Variant1;

static STATIC19: Box<isize> =
    box 3;
//~^ ERROR allocations are not allowed in statics

pub fn main() {
    let y = { static x: Box<isize> = box 3; x };
    //~^ ERROR allocations are not allowed in statics
    //~| ERROR cannot move out of static item
}