remove more redundant into() conversions

Author: matthiaskrgr

compiler/rustc_hir_analysis/src/collect/predicates_of.rs

@@ -1036,7 +1036,7 @@ pub(super) fn const_conditions<'tcx>(
 
         icx.lowerer().lower_bounds(
             tcx.types.self_param,
-            supertraits.into_iter(),
+            supertraits,
             &mut bounds,
             ty::List::empty(),
             PredicateFilter::ConstIfConst,

compiler/rustc_mir_transform/src/coverage/mappings.rs

@@ -367,9 +367,8 @@ fn calc_test_vectors_index(conditions: &mut Vec<MCDCBranch>) -> usize {
         })
         .collect::<FxIndexMap<_, _>>();
 
-    let mut queue = std::collections::VecDeque::from_iter(
-        next_conditions.swap_remove(&ConditionId::START).into_iter(),
-    );
+    let mut queue =
+        std::collections::VecDeque::from_iter(next_conditions.swap_remove(&ConditionId::START));
     num_paths_stats[ConditionId::START] = 1;
     let mut decision_end_nodes = Vec::new();
     while let Some(branch) = queue.pop_front() {

compiler/rustc_mir_transform/src/lint_tail_expr_drop_order.rs

@@ -691,7 +691,7 @@ impl Subdiagnostic for LocalLabel<'_> {
         for dtor in self.destructors {
             dtor.add_to_diag_with(diag, f);
         }
-        let msg = f(diag, crate::fluent_generated::mir_transform_label_local_epilogue.into());
+        let msg = f(diag, crate::fluent_generated::mir_transform_label_local_epilogue);
         diag.span_label(self.span, msg);
     }
 }