diff options
| -rw-r--r-- | src/test/ui/parser/intersection-patterns.rs | 40 | ||||
| -rw-r--r-- | src/test/ui/parser/intersection-patterns.stderr | 33 |
2 files changed, 73 insertions, 0 deletions
diff --git a/src/test/ui/parser/intersection-patterns.rs b/src/test/ui/parser/intersection-patterns.rs new file mode 100644 index 00000000000..1dda21519e3 --- /dev/null +++ b/src/test/ui/parser/intersection-patterns.rs @@ -0,0 +1,40 @@ +// This tests the parser recovery in `recover_intersection_pat` +// and serves as a regression test for the diagnostics issue #65400. +// +// The general idea is that for `$pat_lhs @ $pat_rhs` where +// `$pat_lhs` is not generated by `ref? mut? $ident` we want +// to suggest either switching the order or note that intersection +// patterns are not allowed. + +fn main() { + let s: Option<u8> = None; + + match s { + Some(x) @ y => {} + //~^ ERROR pattern on wrong side of `@` + //~| pattern on the left, should be to the right + //~| binding on the right, should be to the left + //~| HELP switch the order + //~| SUGGESTION y@Some(x) + _ => {} + } + + match s { + Some(x) @ Some(y) => {} + //~^ ERROR left-hand side of `@` must be a binding pattern + //~| interpreted as a pattern, not a binding + //~| also a pattern + //~| NOTE bindings are `x`, `mut x`, `ref x`, and `ref mut x` + _ => {} + } + + match 2 { + 1 ..= 5 @ e => {} + //~^ ERROR pattern on wrong side of `@` + //~| pattern on the left, should be to the right + //~| binding on the right, should be to the left + //~| HELP switch the order + //~| SUGGESTION e@1 ..=5 + _ => {} + } +} diff --git a/src/test/ui/parser/intersection-patterns.stderr b/src/test/ui/parser/intersection-patterns.stderr new file mode 100644 index 00000000000..03781f8fdee --- /dev/null +++ b/src/test/ui/parser/intersection-patterns.stderr @@ -0,0 +1,33 @@ +error: pattern on wrong side of `@` + --> $DIR/intersection-patterns.rs:13:9 + | +LL | Some(x) @ y => {} + | -------^^^- + | | | + | | binding on the right, should be to the left + | pattern on the left, should be to the right + | help: switch the order: `y@Some(x)` + +error: left-hand side of `@` must be a binding pattern + --> $DIR/intersection-patterns.rs:23:9 + | +LL | Some(x) @ Some(y) => {} + | -------^^^------- + | | | + | | also a pattern + | interpreted as a pattern, not a binding + | + = note: bindings are `x`, `mut x`, `ref x`, and `ref mut x` + +error: pattern on wrong side of `@` + --> $DIR/intersection-patterns.rs:32:9 + | +LL | 1 ..= 5 @ e => {} + | -------^^^- + | | | + | | binding on the right, should be to the left + | pattern on the left, should be to the right + | help: switch the order: `e@1 ..=5` + +error: aborting due to 3 previous errors + |