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git.proxmox.com Git - rustc.git/blob - src/test/ui/or-patterns/nested-undelimited-precedence.rs
1 // This test tests the precedence of `|` (or-patterns) undelimited nested patterns. In particular,
2 // we want to reserve the syntactic space of a pattern followed by a type annotation for possible
3 // future type ascription, so we need to make sure that any time a pattern is followed by type
4 // annotation (for now), the pattern is not a top-level or-pattern. However, there are also a few
5 // types of patterns that allow undelimited subpatterns that could cause the same ambiguity.
6 // Currently, those should be impossible due to precedence rule. This test enforces that.
8 #![feature(or_patterns)]
19 let b @
(A
| B
): E
= A
;
21 let b @ A
| B
: E
= A
; //~ERROR `b` is not bound in all patterns
22 //~^ ERROR top-level or-patterns are not allowed
34 let (A(x
) | B(x
)): F
= A(3);
36 let &A(_
) | B(_
): F
= A(3); //~ERROR mismatched types
37 //~^ ERROR top-level or-patterns are not allowed
38 let &&A(_
) | B(_
): F
= A(3); //~ERROR mismatched types
39 //~^ ERROR top-level or-patterns are not allowed
40 let &mut A(_
) | B(_
): F
= A(3); //~ERROR mismatched types
41 //~^ ERROR top-level or-patterns are not allowed
42 let &&mut A(_
) | B(_
): F
= A(3); //~ERROR mismatched types
43 //~^ ERROR top-level or-patterns are not allowed