rust/tests/ui/statics/issue-44373-2.rs

// check-pass
#![allow(dead_code)]

struct Foo(bool);

struct Container(&'static [&'static Foo]);

static FOO: Foo = Foo(true);
static CONTAINER: Container = Container(&[&FOO]);

fn main() {}
Use check-pass in ui tests where appropriate 2019-11-04 00:00:00 +00:00			`// check-pass`
Add `#![allow(..)]` as necessary to get re-migrated run-pass tests compiling with clean stderr again. Most were added mechanically. 2018-09-25 21:51:35 +00:00			`#![allow(dead_code)]`
rustc_mir: promote references of statics from other statics. 2017-12-05 23:28:27 +00:00
Fix regression in promotion of rvalues referencing a static This commit makes librustc_passes::consts::CheckCrateVisitor properly mark expressions as promotable if they reference a static, as it's perfectly fine for one static to reference another. It fixes a regression that prevented a temporary rvalue from referencing a static if it was itself declared within a static. Prior to commit https://github.com/rust-lang/rust/commit/b8c05fe90bc, `region::ScopeTree` would only register a 'terminating scope' for function bodies. Thus, while rvalues in a static that referenced a static would be marked unpromotable, the lack of enclosing scope would cause mem_categorization::MemCategorizationContext::cat_rvalue_node to compute a 'temporary scope' of `ReStatic`. Since this had the same effect as explicitly selecting a scope of `ReStatic` due to the rvalue being marked by CheckCrateVisitor as promotable, no issue occurred. However, commit https://github.com/rust-lang/rust/commit/b8c05fe90bc made ScopeTree unconditionally register a 'terminating scope' Since mem_categorization would now compute a non-static 'temporary scope', the aforementioned rvalues would be erroneously marked as living for too short a time. By fixing the behavior of CheckCrateVisitor, this commit avoids changing mem_categorization's behavior, while ensuring that temporary values in statics are still allowed to reference other statics. Fixes issue #44373 2017-09-09 00:22:50 +00:00			`struct Foo(bool);`

			`struct Container(&'static [&'static Foo]);`

			`static FOO: Foo = Foo(true);`
			`static CONTAINER: Container = Container(&[&FOO]);`

			`fn main() {}`