Polonius: don't emit var_maybe_initialized_on_exit

Author: Albin Stjerna

src/librustc_mir/borrow_check/nll/type_check/liveness/trace.rs

@@ -131,12 +131,6 @@ impl LivenessResults<'me, 'typeck, 'flow, 'tcx> {
         for local in live_locals {
             self.reset_local_state();
             self.add_defs_for(local);
-
-            // FIXME: this is temporary until we can generate our own initialization
-            if self.cx.typeck.borrowck_context.all_facts.is_some() {
-                self.add_polonius_var_maybe_initialized_on_exit_for(local)
-            }
-
             self.compute_use_live_points_for(local);
             self.compute_drop_live_points_for(local);
 
@@ -157,63 +151,6 @@ impl LivenessResults<'me, 'typeck, 'flow, 'tcx> {
         }
     }
 
-    // WARNING: panics if self.cx.typeck.borrowck_context.all_facts != None
-    //
-    // FIXME: this analysis (the initialization tracking) should be
-    // done in Polonius, but isn't yet.
-    fn add_polonius_var_maybe_initialized_on_exit_for(&mut self, local: Local) {
-        let move_path = self.cx.move_data.rev_lookup.find_local(local);
-        let facts = self.cx.typeck.borrowck_context.all_facts.as_mut().unwrap();
-        for block in self.cx.body.basic_blocks().indices() {
-            debug!("polonius: generating initialization facts for {:?} in {:?}", local, block);
-
-            // iterate through the block, applying the effects of each statement
-            // up to and including location, and populate `var_maybe_initialized_on_exit`
-            self.cx.flow_inits.reset_to_entry_of(block);
-            let start_location = Location { block, statement_index: 0 };
-            self.cx.flow_inits.apply_local_effect(start_location);
-
-            for statement_index in 0..self.cx.body[block].statements.len() {
-                let current_location = Location { block, statement_index };
-
-                self.cx.flow_inits.reconstruct_statement_effect(current_location);
-
-                // statement has not yet taken effect:
-                if self.cx.flow_inits.has_any_child_of(move_path).is_some() {
-                    facts
-                        .var_maybe_initialized_on_exit
-                        .push((local, self.cx.location_table.start_index(current_location)));
-                }
-
-                // statement has now taken effect
-                self.cx.flow_inits.apply_local_effect(current_location);
-
-                if self.cx.flow_inits.has_any_child_of(move_path).is_some() {
-                    facts
-                        .var_maybe_initialized_on_exit
-                        .push((local, self.cx.location_table.mid_index(current_location)));
-                }
-            }
-
-            let terminator_location = self.cx.body.terminator_loc(block);
-
-            if self.cx.flow_inits.has_any_child_of(move_path).is_some() {
-                facts
-                    .var_maybe_initialized_on_exit
-                    .push((local, self.cx.location_table.start_index(terminator_location)));
-            }
-
-            // apply the effects of the terminator and push it if needed
-            self.cx.flow_inits.reset_to_exit_of(block);
-
-            if self.cx.flow_inits.has_any_child_of(move_path).is_some() {
-                facts
-                    .var_maybe_initialized_on_exit
-                    .push((local, self.cx.location_table.mid_index(terminator_location)));
-            }
-        }
-    }
-
     /// Clear the value of fields that are "per local variable".
     fn reset_local_state(&mut self) {
         self.defs.clear();