mirror of https://github.com/rust-lang/rust
53 lines
1.4 KiB
Rust
53 lines
1.4 KiB
Rust
//@ aux-build:empty.rs
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//@ revisions: normal exhaustive_patterns
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//
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// This tests a match with no arms on various types, and checks NOTEs.
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#![feature(never_type)]
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#![cfg_attr(exhaustive_patterns, feature(exhaustive_patterns))]
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#![deny(unreachable_patterns)]
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//~^ NOTE the lint level is defined here
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extern crate empty;
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enum EmptyEnum {}
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fn empty_enum(x: EmptyEnum) {
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match x {} // ok
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match x {
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_ => {} //~ ERROR unreachable pattern
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}
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match x {
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_ if false => {} //~ ERROR unreachable pattern
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}
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}
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fn empty_foreign_enum(x: empty::EmptyForeignEnum) {
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match x {} // ok
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match x {
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_ => {} //~ ERROR unreachable pattern
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}
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match x {
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_ if false => {} //~ ERROR unreachable pattern
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}
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}
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fn empty_foreign_enum_private(x: Option<empty::SecretlyUninhabitedForeignStruct>) {
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let None = x;
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//~^ ERROR refutable pattern in local binding
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//~| NOTE `let` bindings require an "irrefutable pattern"
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//~| NOTE for more information, visit
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//~| NOTE the matched value is of type
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//~| NOTE pattern `Some(_)` not covered
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//[exhaustive_patterns]~| NOTE currently uninhabited, but this variant contains private fields
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}
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fn main() {
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match 0u8 {
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//~^ ERROR not covered
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//~| NOTE the matched value is of type
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//~| NOTE match arms with guards don't count towards exhaustivity
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//~| NOTE not covered
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_ if false => {}
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}
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}
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