diff options
Diffstat (limited to 'src/test/ui/consts/rvalue-static-promotion.rs')
-rw-r--r-- | src/test/ui/consts/rvalue-static-promotion.rs | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/test/ui/consts/rvalue-static-promotion.rs b/src/test/ui/consts/rvalue-static-promotion.rs new file mode 100644 index 000000000..c48d9eae9 --- /dev/null +++ b/src/test/ui/consts/rvalue-static-promotion.rs @@ -0,0 +1,19 @@ +// run-pass + +use std::cell::Cell; + +const NONE_CELL_STRING: Option<Cell<String>> = None; + +struct Foo<T>(#[allow(unused_tuple_struct_fields)] T); +impl<T> Foo<T> { + const FOO: Option<Box<T>> = None; +} + +fn main() { + let _: &'static u32 = &42; + let _: &'static Option<u32> = &None; + + // We should be able to peek at consts and see they're None. + let _: &'static Option<Cell<String>> = &NONE_CELL_STRING; + let _: &'static Option<Box<()>> = &Foo::FOO; +} |