Rollup merge of #61814 - varkor:uninhabited-const-61744, r=oli-obk
Fix an ICE with uninhabited consts
Fixes https://github.com/rust-lang/rust/issues/61744.
r? @oli-obk
diff --git a/src/librustc/ty/inhabitedness/mod.rs b/src/librustc/ty/inhabitedness/mod.rs
index 5ce7508..0d96e5e 100644
--- a/src/librustc/ty/inhabitedness/mod.rs
+++ b/src/librustc/ty/inhabitedness/mod.rs
@@ -97,7 +97,7 @@
self.ty_inhabitedness_forest(ty).contains(self, module)
}
- pub fn is_ty_uninhabited_from_all_modules(self, ty: Ty<'tcx>) -> bool {
+ pub fn is_ty_uninhabited_from_any_module(self, ty: Ty<'tcx>) -> bool {
!self.ty_inhabitedness_forest(ty).is_empty()
}
diff --git a/src/librustc_mir/interpret/terminator.rs b/src/librustc_mir/interpret/terminator.rs
index af061f9..a29611e 100644
--- a/src/librustc_mir/interpret/terminator.rs
+++ b/src/librustc_mir/interpret/terminator.rs
@@ -388,12 +388,10 @@
));
}
} else {
- let callee_layout =
- self.layout_of_local(self.frame(), mir::RETURN_PLACE, None)?;
- if !callee_layout.abi.is_uninhabited() {
- return err!(FunctionRetMismatch(
- self.tcx.types.never, callee_layout.ty
- ));
+ let local = mir::RETURN_PLACE;
+ let ty = self.frame().body.local_decls[local].ty;
+ if !self.tcx.is_ty_uninhabited_from_any_module(ty) {
+ return err!(FunctionRetMismatch(self.tcx.types.never, ty));
}
}
Ok(())
diff --git a/src/test/ui/consts/uninhabited-const-issue-61744.rs b/src/test/ui/consts/uninhabited-const-issue-61744.rs
new file mode 100644
index 0000000..21fbbf8
--- /dev/null
+++ b/src/test/ui/consts/uninhabited-const-issue-61744.rs
@@ -0,0 +1,19 @@
+// compile-fail
+
+pub const unsafe fn fake_type<T>() -> T {
+ hint_unreachable()
+}
+
+pub const unsafe fn hint_unreachable() -> ! {
+ fake_type() //~ ERROR any use of this value will cause an error
+}
+
+trait Const {
+ const CONSTANT: i32 = unsafe { fake_type() };
+}
+
+impl <T> Const for T {}
+
+pub fn main() -> () {
+ dbg!(i32::CONSTANT); //~ ERROR erroneous constant used
+}
diff --git a/src/test/ui/consts/uninhabited-const-issue-61744.stderr b/src/test/ui/consts/uninhabited-const-issue-61744.stderr
new file mode 100644
index 0000000..5c28554
--- /dev/null
+++ b/src/test/ui/consts/uninhabited-const-issue-61744.stderr
@@ -0,0 +1,24 @@
+error: any use of this value will cause an error
+ --> $DIR/uninhabited-const-issue-61744.rs:8:5
+ |
+LL | fake_type()
+ | ^^^^^^^^^^^
+ | |
+ | tried to call a function with return type T passing return place of type !
+ | inside call to `hint_unreachable` at $DIR/uninhabited-const-issue-61744.rs:4:5
+ | inside call to `fake_type::<i32>` at $DIR/uninhabited-const-issue-61744.rs:12:36
+...
+LL | const CONSTANT: i32 = unsafe { fake_type() };
+ | ---------------------------------------------
+ |
+ = note: #[deny(const_err)] on by default
+
+error[E0080]: erroneous constant used
+ --> $DIR/uninhabited-const-issue-61744.rs:18:10
+ |
+LL | dbg!(i32::CONSTANT);
+ | ^^^^^^^^^^^^^ referenced constant has errors
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0080`.
