74 lines
1.7 KiB
Rust
74 lines
1.7 KiB
Rust
// Check that never patterns require the feature gate.
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use std::ptr::NonNull;
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enum Void {}
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fn main() {
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let res: Result<u32, Void> = Ok(0);
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let (Ok(_x) | Err(&!)) = res.as_ref();
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//~^ ERROR `!` patterns are experimental
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unsafe {
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let ptr: *const Void = NonNull::dangling().as_ptr();
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match *ptr {
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!
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//~^ ERROR `!` patterns are experimental
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}
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// Check that the gate operates even behind `cfg`.
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#[cfg(FALSE)]
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match *ptr {
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!
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//~^ ERROR `!` patterns are experimental
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}
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#[cfg(FALSE)]
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match *ptr {
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! => {}
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//~^ ERROR `!` patterns are experimental
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}
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}
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// Correctly gate match arms with no body.
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match Some(0) {
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None => {}
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Some(_),
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//~^ ERROR unexpected `,` in pattern
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}
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match Some(0) {
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None => {}
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Some(_)
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//~^ ERROR `match` arm with no body
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}
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match Some(0) {
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_ => {}
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Some(_) if false,
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//~^ ERROR `match` arm with no body
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Some(_) if false
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//~^ ERROR `match` arm with no body
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}
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match res {
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Ok(_) => {}
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Err(!),
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//~^ ERROR `!` patterns are experimental
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}
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match res {
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Err(!) if false,
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//~^ ERROR `!` patterns are experimental
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//~| ERROR a guard on a never pattern will never be run
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_ => {}
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}
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// Check that the gate operates even behind `cfg`.
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match Some(0) {
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None => {}
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#[cfg(FALSE)]
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Some(_)
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//~^ ERROR `match` arm with no body
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}
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match Some(0) {
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_ => {}
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#[cfg(FALSE)]
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Some(_) if false
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//~^ ERROR `match` arm with no body
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}
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}
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