mirror of https://github.com/rust-lang/rust
45 lines
1.3 KiB
Rust
45 lines
1.3 KiB
Rust
// This test tests the precedence of `|` (or-patterns) undelimited nested patterns. In particular,
|
|
// we want to reserve the syntactic space of a pattern followed by a type annotation for possible
|
|
// future type ascription, so we need to make sure that any time a pattern is followed by type
|
|
// annotation (for now), the pattern is not a top-level or-pattern. However, there are also a few
|
|
// types of patterns that allow undelimited subpatterns that could cause the same ambiguity.
|
|
// Currently, those should be impossible due to precedence rule. This test enforces that.
|
|
|
|
enum E {
|
|
A,
|
|
B,
|
|
}
|
|
|
|
fn foo() {
|
|
use E::*;
|
|
|
|
// ok
|
|
let b @ (A | B): E = A;
|
|
|
|
let b @ A | B: E = A; //~ERROR `b` is not bound in all patterns
|
|
//~^ ERROR top-level or-patterns are not allowed
|
|
}
|
|
|
|
enum F {
|
|
A(usize),
|
|
B(usize),
|
|
}
|
|
|
|
fn bar() {
|
|
use F::*;
|
|
|
|
// ok
|
|
let (A(x) | B(x)): F = A(3);
|
|
|
|
let &A(_) | B(_): F = A(3); //~ERROR mismatched types
|
|
//~^ ERROR top-level or-patterns are not allowed
|
|
let &&A(_) | B(_): F = A(3); //~ERROR mismatched types
|
|
//~^ ERROR top-level or-patterns are not allowed
|
|
let &mut A(_) | B(_): F = A(3); //~ERROR mismatched types
|
|
//~^ ERROR top-level or-patterns are not allowed
|
|
let &&mut A(_) | B(_): F = A(3); //~ERROR mismatched types
|
|
//~^ ERROR top-level or-patterns are not allowed
|
|
}
|
|
|
|
fn main() {}
|