Delay bug to prevent ICE in MIR borrowck

Author: JohnTitor

src/librustc_mir/transform/elaborate_drops.rs

@@ -28,7 +28,13 @@ impl<'tcx> MirPass<'tcx> for ElaborateDrops {
         let param_env = tcx.param_env(src.def_id()).with_reveal_all();
         let move_data = match MoveData::gather_moves(body, tcx, param_env) {
             Ok(move_data) => move_data,
-            Err(_) => bug!("No `move_errors` should be allowed in MIR borrowck"),
+            Err((move_data, _)) => {
+                tcx.sess.delay_span_bug(
+                    body.span,
+                    "No `move_errors` should be allowed in MIR borrowck",
+                );
+                move_data
+            }
         };
         let elaborate_patch = {
             let body = &*body;

src/test/ui/mir/issue-67947.rs

@@ -0,0 +1,7 @@
+struct Bug {
+    A: [(); { *"" }.len()],
+    //~^ ERROR: cannot move a value of type str
+    //~| ERROR: cannot move out of a shared reference
+}
+
+fn main() {}

src/test/ui/mir/issue-67947.stderr

@@ -0,0 +1,16 @@
+error[E0161]: cannot move a value of type str: the size of str cannot be statically determined
+  --> $DIR/issue-67947.rs:2:13
+   |
+LL |     A: [(); { *"" }.len()],
+   |             ^^^^^^^
+
+error[E0507]: cannot move out of a shared reference
+  --> $DIR/issue-67947.rs:2:15
+   |
+LL |     A: [(); { *"" }.len()],
+   |               ^^^ move occurs because value has type `str`, which does not implement the `Copy` trait
+
+error: aborting due to 2 previous errors
+
+Some errors have detailed explanations: E0161, E0507.
+For more information about an error, try `rustc --explain E0161`.