remove empty util module

compiler/rustc_borrowck/src/lib.rs

@@ -81,7 +81,6 @@ mod session_diagnostics;
 mod type_check;
 mod universal_regions;
 mod used_muts;
-mod util;
 
 /// A public API provided for the Rust compiler consumers.
 pub mod consumers;

compiler/rustc_borrowck/src/util/collect_writes.rs

@@ -1,35 +0,0 @@
-use rustc_middle::mir::visit::{PlaceContext, Visitor};
-use rustc_middle::mir::{Body, Local, Location};
-
-pub(crate) trait FindAssignments {
-    // Finds all statements that assign directly to local (i.e., X = ...)
-    // and returns their locations.
-    fn find_assignments(&self, local: Local) -> Vec<Location>;
-}
-
-impl<'tcx> FindAssignments for Body<'tcx> {
-    fn find_assignments(&self, local: Local) -> Vec<Location> {
-        let mut visitor = FindLocalAssignmentVisitor { needle: local, locations: vec![] };
-        visitor.visit_body(self);
-        visitor.locations
-    }
-}
-
-// The Visitor walks the MIR to return the assignment statements corresponding
-// to a Local.
-struct FindLocalAssignmentVisitor {
-    needle: Local,
-    locations: Vec<Location>,
-}
-
-impl<'tcx> Visitor<'tcx> for FindLocalAssignmentVisitor {
-    fn visit_local(&mut self, local: Local, place_context: PlaceContext, location: Location) {
-        if self.needle != local {
-            return;
-        }
-
-        if place_context.is_place_assignment() {
-            self.locations.push(location);
-        }
-    }
-}

compiler/rustc_borrowck/src/util/mod.rs

@@ -1,3 +0,0 @@
-mod collect_writes;
-
-pub(crate) use collect_writes::FindAssignments;