Don't re-export std::ops::ControlFlow in the compiler.

Author: NoraCodes

compiler/rustc_data_structures/src/graph/iterate/mod.rs

@@ -1,6 +1,7 @@
 use super::{DirectedGraph, WithNumNodes, WithStartNode, WithSuccessors};
 use rustc_index::bit_set::BitSet;
 use rustc_index::vec::IndexVec;
+use std::ops::ControlFlow;
 
 #[cfg(test)]
 mod tests;
@@ -86,9 +87,6 @@ where
     }
 }
 
-/// Allows searches to terminate early with a value.
-pub use std::ops::ControlFlow;
-
 /// The status of a node in the depth-first search.
 ///
 /// See the documentation of `TriColorDepthFirstSearch` to see how a node's status is updated

compiler/rustc_mir_build/src/lints.rs

@@ -1,5 +1,5 @@
 use rustc_data_structures::graph::iterate::{
-    ControlFlow, NodeStatus, TriColorDepthFirstSearch, TriColorVisitor,
+    NodeStatus, TriColorDepthFirstSearch, TriColorVisitor,
 };
 use rustc_hir::intravisit::FnKind;
 use rustc_middle::hir::map::blocks::FnLikeNode;
@@ -8,6 +8,7 @@ use rustc_middle::ty::subst::{GenericArg, InternalSubsts};
 use rustc_middle::ty::{self, AssocItem, AssocItemContainer, Instance, TyCtxt};
 use rustc_session::lint::builtin::UNCONDITIONAL_RECURSION;
 use rustc_span::Span;
+use std::ops::ControlFlow;
 
 crate fn check<'tcx>(tcx: TyCtxt<'tcx>, body: &Body<'tcx>) {
     let def_id = body.source.def_id().expect_local();