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//! Checks for compilation errors related to adding contracts to non-function items.
#![feature(contracts)]
//~^ WARN the feature `contracts` is incomplete and may not be safe to use and/or cause compiler crashes [incomplete_features]
#![allow(dead_code)]
#[core::contracts::requires(true)]
//~^ ERROR contract annotations can only be used on functions
struct Dummy(usize);
#[core::contracts::ensures(|v| v == 100)]
//~^ ERROR contract annotations can only be used on functions
const MAX_VAL: usize = 100;
// FIXME: Improve the error message here. The macro thinks this is a function.
#[core::contracts::ensures(|v| v == 100)]
//~^ ERROR contract annotations is only supported in functions with bodies
type NewDummy = fn(usize) -> Dummy;
#[core::contracts::ensures(|v| v == 100)]
//~^ ERROR contract annotations is only supported in functions with bodies
const NEW_DUMMY_FN : fn(usize) -> Dummy = || { Dummy(0) };
#[core::contracts::requires(true)]
//~^ ERROR contract annotations can only be used on functions
impl Dummy {
// This should work
#[core::contracts::ensures(|ret| ret.0 == v)]
fn new(v: usize) -> Dummy {
Dummy(v)
}
}
#[core::contracts::ensures(|dummy| dummy.0 > 0)]
//~^ ERROR contract annotations can only be used on functions
impl From<usize> for Dummy {
// This should work.
#[core::contracts::ensures(|ret| ret.0 == v)]
fn from(value: usize) -> Self {
Dummy::new(value)
}
}
/// You should not be able to annotate a trait either.
#[core::contracts::requires(true)]
//~^ ERROR contract annotations can only be used on functions
pub trait DummyBuilder {
fn build() -> Dummy;
}
fn main() {
}
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