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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /src/test/ui/or-patterns/nested-undelimited-precedence.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/test/ui/or-patterns/nested-undelimited-precedence.rs')
-rw-r--r-- | src/test/ui/or-patterns/nested-undelimited-precedence.rs | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/src/test/ui/or-patterns/nested-undelimited-precedence.rs b/src/test/ui/or-patterns/nested-undelimited-precedence.rs new file mode 100644 index 000000000..047836203 --- /dev/null +++ b/src/test/ui/or-patterns/nested-undelimited-precedence.rs @@ -0,0 +1,44 @@ +// 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() {} |