set up GetTagId

compiler/mono/src/borrow.rs

@@ -580,6 +580,19 @@ impl<'a> BorrowInfState<'a> {
             Call(call) => self.collect_call(z, call),
 
             Literal(_) | RuntimeErrorFunction(_) => {}
+
+            GetTagId { structure: x, .. } => {
+                // if the structure (record/tag/array) is owned, the extracted value is
+                if self.is_owned(*x) {
+                    self.own_var(z);
+                }
+
+                // if the extracted value is owned, the structure must be too
+                if self.is_owned(z) {
+                    self.own_var(*x);
+                }
+            }
+
         }
     }