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|
#![feature(never_type)]
fn not_a_read() -> ! {
unsafe {
//~^ ERROR mismatched types
let x: *const ! = 0 as _;
let _: ! = *x;
// Since `*x` "diverges" in HIR, but doesn't count as a read in MIR, this
// is unsound since we act as if it diverges but it doesn't.
}
}
fn not_a_read_implicit() -> ! {
unsafe {
//~^ ERROR mismatched types
let x: *const ! = 0 as _;
let _ = *x;
}
}
fn not_a_read_guide_coercion() -> ! {
unsafe {
//~^ ERROR mismatched types
let x: *const ! = 0 as _;
let _: () = *x;
//~^ ERROR mismatched types
}
}
fn empty_match() -> ! {
unsafe {
//~^ ERROR mismatched types
let x: *const ! = 0 as _;
match *x { _ => {} };
}
}
fn field_projection() -> ! {
unsafe {
//~^ ERROR mismatched types
let x: *const (!, ()) = 0 as _;
let _ = (*x).0;
// ^ I think this is still UB, but because of the inbounds projection.
}
}
fn covered_arm() -> ! {
unsafe {
//~^ ERROR mismatched types
let x: *const ! = 0 as _;
let (_ | 1i32) = *x;
//~^ ERROR mismatched types
}
}
// FIXME: This *could* be considered a read of `!`, but we're not that sophisticated..
fn uncovered_arm() -> ! {
unsafe {
//~^ ERROR mismatched types
let x: *const ! = 0 as _;
let (1i32 | _) = *x;
//~^ ERROR mismatched types
}
}
fn coerce_ref_binding() -> ! {
unsafe {
let x: *const ! = 0 as _;
let ref _x: () = *x;
//~^ ERROR mismatched types
}
}
fn main() {}
|
