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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-17 12:02:58 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-17 12:02:58 +0000
commit698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch)
tree173a775858bd501c378080a10dca74132f05bc50 /src/test/ui/destructure-trait-ref.rs
parentInitial commit. (diff)
downloadrustc-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/destructure-trait-ref.rs')
-rw-r--r--src/test/ui/destructure-trait-ref.rs44
1 files changed, 44 insertions, 0 deletions
diff --git a/src/test/ui/destructure-trait-ref.rs b/src/test/ui/destructure-trait-ref.rs
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+// The regression test for #15031 to make sure destructuring trait
+// reference work properly.
+
+#![feature(box_patterns)]
+
+trait T { fn foo(&self) {} }
+impl T for isize {}
+
+
+fn main() {
+ // For an expression of the form:
+ //
+ // let &...&x = &..&SomeTrait;
+ //
+ // Say we have n `&` at the left hand and m `&` right hand, then:
+ // if n < m, we are golden;
+ // if n == m, it's a derefing non-derefable type error;
+ // if n > m, it's a type mismatch error.
+
+ // n < m
+ let &x = &(&1isize as &dyn T);
+ let &x = &&(&1isize as &dyn T);
+ let &&x = &&(&1isize as &dyn T);
+
+ // n == m
+ let &x = &1isize as &dyn T; //~ ERROR type `&dyn T` cannot be dereferenced
+ let &&x = &(&1isize as &dyn T); //~ ERROR type `&dyn T` cannot be dereferenced
+ let box x = Box::new(1isize) as Box<dyn T>;
+ //~^ ERROR type `Box<dyn T>` cannot be dereferenced
+
+ // n > m
+ let &&x = &1isize as &dyn T;
+ //~^ ERROR mismatched types
+ //~| expected trait object `dyn T`
+ //~| found reference `&_`
+ let &&&x = &(&1isize as &dyn T);
+ //~^ ERROR mismatched types
+ //~| expected trait object `dyn T`
+ //~| found reference `&_`
+ let box box x = Box::new(1isize) as Box<dyn T>;
+ //~^ ERROR mismatched types
+ //~| expected trait object `dyn T`
+ //~| found struct `Box<_>`
+}