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|
// run-pass
#![allow(dead_code)]
#![allow(unused_assignments)]
#![allow(unused_variables)]
#![allow(unreachable_code)]
// Test various cases where we permit an unconstrained variable
// to fallback based on control-flow.
//
// These represent current behavior, but are pretty dubious. I would
// like to revisit these and potentially change them. --nmatsakis
#![feature(never_type)]
trait BadDefault {
fn default() -> Self;
}
impl BadDefault for u32 {
fn default() -> Self {
0
}
}
impl BadDefault for ! {
fn default() -> ! {
panic!()
}
}
fn assignment() {
let x;
if true {
x = BadDefault::default();
} else {
x = return;
}
}
fn assignment_rev() {
let x;
if true {
x = return;
} else {
x = BadDefault::default();
}
}
fn if_then_else() {
let _x = if true {
BadDefault::default()
} else {
return;
};
}
fn if_then_else_rev() {
let _x = if true {
return;
} else {
BadDefault::default()
};
}
fn match_arm() {
let _x = match Ok(BadDefault::default()) {
Ok(v) => v,
Err(()) => return,
};
}
fn match_arm_rev() {
let _x = match Ok(BadDefault::default()) {
Err(()) => return,
Ok(v) => v,
};
}
fn loop_break() {
let _x = loop {
if false {
break return;
} else {
break BadDefault::default();
}
};
}
fn loop_break_rev() {
let _x = loop {
if false {
break return;
} else {
break BadDefault::default();
}
};
}
fn main() { }
|
