Update to the rustfmt in rust 1.28, which is now stable.

Also, rustfmt's --write-mode=check is now named --check.

cranelift/test-all.sh

@@ -27,7 +27,7 @@ function banner {
 # Run rustfmt if we have it.
 banner "Rust formatting"
 if type rustfmt > /dev/null; then
-    if ! "$topdir/format-all.sh" --write-mode=check ; then
+    if ! "$topdir/format-all.sh" --check ; then
         echo "Formatting diffs detected! Run \"cargo fmt --all\" to correct."
         exit 1
     fi

lib/codegen/src/bforest/path.rs

@@ -621,7 +621,8 @@ impl<F: Forest> Path<F> {
 
     /// Update the critical key for the right sibling node at `level`.
     fn update_right_crit_key(&self, level: usize, crit_key: F::Key, pool: &mut NodePool<F>) {
-        let bl = self.right_sibling_branch_level(level, pool)
+        let bl = self
+            .right_sibling_branch_level(level, pool)
             .expect("No right sibling exists");
         match pool[self.node[bl]] {
             NodeData::Inner { ref mut keys, .. } => {

lib/codegen/src/binemit/relaxation.rs

@@ -151,7 +151,8 @@ fn relax_branch(
     // Pick the first encoding that can handle the branch range.
     let dfg = &cur.func.dfg;
     let ctrl_type = dfg.ctrl_typevar(inst);
-    if let Some(enc) = isa.legal_encodings(cur.func, &dfg[inst], ctrl_type)
+    if let Some(enc) = isa
+        .legal_encodings(cur.func, &dfg[inst], ctrl_type)
         .find(|&enc| {
             let range = encinfo.branch_range(enc).expect("Branch with no range");
             if !range.contains(offset, dest_offset) {

lib/codegen/src/binemit/shrink.rs

@@ -39,13 +39,14 @@ pub fn shrink_instructions(func: &mut Function, isa: &TargetIsa) {
                         divert.apply(&func.dfg[inst]);
                         continue;
                     }
-                   _ => ()
+                    _ => (),
                 }
 
                 let ctrl_type = func.dfg.ctrl_typevar(inst);
 
                 // Pick the last encoding with constraints that are satisfied.
-                let best_enc = isa.legal_encodings(func, &func.dfg[inst], ctrl_type)
+                let best_enc = isa
+                    .legal_encodings(func, &func.dfg[inst], ctrl_type)
                     .filter(|e| encinfo.constraints[e.recipe()].satisfied(inst, &divert, &func))
                     .min_by_key(|e| encinfo.bytes(*e))
                     .unwrap();

lib/codegen/src/cursor.rs

@@ -752,7 +752,8 @@ impl<'c, 'f> ir::InstInserterBase<'c> for &'c mut EncCursor<'f> {
         // Assign an encoding.
         // XXX Is there a way to describe this error to the user?
         #[cfg_attr(feature = "cargo-clippy", allow(match_wild_err_arm))]
-        match self.isa
+        match self
+            .isa
             .encode(&self.func, &self.func.dfg[inst], ctrl_typevar)
         {
             Ok(e) => self.func.encodings[inst] = e,

lib/codegen/src/dominator_tree.rs

@@ -422,7 +422,8 @@ impl DominatorTree {
         // Get an iterator with just the reachable, already visited predecessors to `ebb`.
         // Note that during the first pass, `rpo_number` is 1 for reachable blocks that haven't
         // been visited yet, 0 for unreachable blocks.
-        let mut reachable_preds = cfg.pred_iter(ebb)
+        let mut reachable_preds = cfg
+            .pred_iter(ebb)
             .filter(|&BasicBlock { ebb: pred, .. }| self.nodes[pred].rpo_number > 1);
 
         // The RPO must visit at least one predecessor before this node.
@@ -453,7 +454,8 @@ impl DominatorTree {
         }
         // We use the RPO comparison on the postorder list so we invert the operands of the
         // comparison
-        let old_ebb_postorder_index = self.postorder
+        let old_ebb_postorder_index = self
+            .postorder
             .as_slice()
             .binary_search_by(|probe| self.rpo_cmp_ebb(old_ebb, *probe))
             .expect("the old ebb is not declared to the dominator tree");

lib/codegen/src/ir/extfunc.rs

@@ -62,7 +62,8 @@ impl Signature {
     /// Even if there are no stack arguments, this will set `params` to `Some(0)` instead
     /// of `None`. This indicates that the signature has been legalized.
     pub fn compute_argument_bytes(&mut self) {
-        let bytes = self.params
+        let bytes = self
+            .params
             .iter()
             .filter_map(|arg| match arg.location {
                 ArgumentLoc::Stack(offset) if offset >= 0 => {

lib/codegen/src/ir/layout.rs

@@ -182,7 +182,8 @@ impl Layout {
     /// Assign a valid sequence number to `inst` such that the numbers are still monotonic. This may
     /// require renumbering.
     fn assign_inst_seq(&mut self, inst: Inst) {
-        let ebb = self.inst_ebb(inst)
+        let ebb = self
+            .inst_ebb(inst)
             .expect("inst must be inserted before assigning an seq");
 
         // Get the sequence number immediately before `inst`.
@@ -569,7 +570,8 @@ impl Layout {
     /// Insert `inst` before the instruction `before` in the same EBB.
     pub fn insert_inst(&mut self, inst: Inst, before: Inst) {
         debug_assert_eq!(self.inst_ebb(inst), None);
-        let ebb = self.inst_ebb(before)
+        let ebb = self
+            .inst_ebb(before)
             .expect("Instruction before insertion point not in the layout");
         let after = self.insts[before].prev;
         {
@@ -643,7 +645,8 @@ impl Layout {
     ///     i4
     /// ```
     pub fn split_ebb(&mut self, new_ebb: Ebb, before: Inst) {
-        let old_ebb = self.inst_ebb(before)
+        let old_ebb = self
+            .inst_ebb(before)
             .expect("The `before` instruction must be in the layout");
         debug_assert!(!self.is_ebb_inserted(new_ebb));
 

lib/codegen/src/ir/stackslot.rs

@@ -309,7 +309,8 @@ impl StackSlots {
         let size = spill_size(ty);
 
         // Find the smallest existing slot that can fit the type.
-        if let Some(&ss) = self.emergency
+        if let Some(&ss) = self
+            .emergency
             .iter()
             .filter(|&&ss| self[ss].size >= size && !in_use.contains(&ss.into()))
             .min_by_key(|&&ss| self[ss].size)
@@ -318,7 +319,8 @@ impl StackSlots {
         }
 
         // Alternatively, use the largest available slot and make it larger.
-        if let Some(&ss) = self.emergency
+        if let Some(&ss) = self
+            .emergency
             .iter()
             .filter(|&&ss| !in_use.contains(&ss.into()))
             .max_by_key(|&&ss| self[ss].size)

lib/codegen/src/isa/x86/enc_tables.rs

@@ -345,7 +345,8 @@ fn expand_fcvt_to_sint(
     let mut pos = FuncCursor::new(func).after_inst(inst);
     pos.use_srcloc(inst);
 
-    let is_done = pos.ins()
+    let is_done = pos
+        .ins()
         .icmp_imm(IntCC::NotEqual, result, 1 << (ty.lane_bits() - 1));
     pos.ins().brnz(is_done, done, &[]);
 

lib/codegen/src/iterators.rs

@@ -13,11 +13,7 @@ pub trait IteratorExtras: Iterator {
     }
 }
 
-impl<T> IteratorExtras for T
+impl<T> IteratorExtras for T where T: Iterator {}
-where
-    T: Iterator,
-{
-}
 
 /// Adjacent pairs iterator returned by `adjacent_pairs()`.
 ///

lib/codegen/src/legalizer/boundary.rs

@@ -187,7 +187,8 @@ fn legalize_inst_results<ResType>(pos: &mut FuncCursor, mut get_abi_type: ResTyp
 where
     ResType: FnMut(&Function, usize) -> AbiParam,
 {
-    let call = pos.current_inst()
+    let call = pos
+        .current_inst()
         .expect("Cursor must point to a call instruction");
 
     // We theoretically allow for call instructions that return a number of fixed results before
@@ -419,7 +420,8 @@ fn legalize_inst_arguments<ArgType>(
 ) where
     ArgType: FnMut(&Function, usize) -> AbiParam,
 {
-    let inst = pos.current_inst()
+    let inst = pos
+        .current_inst()
         .expect("Cursor must point to a call instruction");
 
     // Lift the value list out of the call instruction so we modify it.
@@ -550,7 +552,8 @@ pub fn handle_return_abi(inst: Inst, func: &mut Function, cfg: &ControlFlowGraph
 
     // Count the special-purpose return values (`link`, `sret`, and `vmctx`) that were appended to
     // the legalized signature.
-    let special_args = func.signature
+    let special_args = func
+        .signature
         .returns
         .iter()
         .rev()
@@ -591,7 +594,8 @@ pub fn handle_return_abi(inst: Inst, func: &mut Function, cfg: &ControlFlowGraph
             // A `link`/`sret`/`vmctx` return value can only appear in a signature that has a
             // unique matching argument. They are appended at the end, so search the signature from
             // the end.
-            let idx = pos.func
+            let idx = pos
+                .func
                 .signature
                 .params
                 .iter()
@@ -599,7 +603,8 @@ pub fn handle_return_abi(inst: Inst, func: &mut Function, cfg: &ControlFlowGraph
                 .expect("No matching special purpose argument.");
             // Get the corresponding entry block value and add it to the return instruction's
             // arguments.
-            let val = pos.func
+            let val = pos
+                .func
                 .dfg
                 .ebb_params(pos.func.layout.entry_block().unwrap())[idx];
             debug_assert_eq!(pos.func.dfg.value_type(val), arg.value_type);
@@ -641,9 +646,11 @@ fn spill_entry_params(func: &mut Function, entry: Ebb) {
 /// or calls between writing the stack slots and the call instruction. Writing the slots earlier
 /// could help reduce register pressure before the call.
 fn spill_call_arguments(pos: &mut FuncCursor) -> bool {
-    let inst = pos.current_inst()
+    let inst = pos
+        .current_inst()
         .expect("Cursor must point to a call instruction");
-    let sig_ref = pos.func
+    let sig_ref = pos
+        .func
         .dfg
         .call_signature(inst)
         .expect("Call instruction expected.");

lib/codegen/src/legalizer/globalvalue.rs

@@ -37,7 +37,8 @@ pub fn expand_global_value(
 /// Expand a `global_value` instruction for a vmctx global.
 fn vmctx_addr(inst: ir::Inst, func: &mut ir::Function, offset: i64) {
     // Get the value representing the `vmctx` argument.
-    let vmctx = func.special_param(ir::ArgumentPurpose::VMContext)
+    let vmctx = func
+        .special_param(ir::ArgumentPurpose::VMContext)
         .expect("Missing vmctx parameter");
 
     // Simply replace the `global_value` instruction with an `iadd_imm`, reusing the result value.

lib/codegen/src/legalizer/heap.rs

@@ -61,20 +61,23 @@ fn dynamic_addr(
     let oob;
     if access_size == 1 {
         // `offset > bound - 1` is the same as `offset >= bound`.
-        oob = pos.ins()
+        oob = pos
+            .ins()
             .icmp(IntCC::UnsignedGreaterThanOrEqual, offset, bound);
     } else if access_size <= min_size {
         // We know that bound >= min_size, so here we can compare `offset > bound - access_size` without
         // wrapping.
         let adj_bound = pos.ins().iadd_imm(bound, -access_size);
-        oob = pos.ins()
+        oob = pos
+            .ins()
             .icmp(IntCC::UnsignedGreaterThan, offset, adj_bound);
     } else {
         // We need an overflow check for the adjusted offset.
         let access_size_val = pos.ins().iconst(offset_ty, access_size);
         let (adj_offset, overflow) = pos.ins().iadd_cout(offset, access_size_val);
         pos.ins().trapnz(overflow, ir::TrapCode::HeapOutOfBounds);
-        oob = pos.ins()
+        oob = pos
+            .ins()
             .icmp(IntCC::UnsignedGreaterThan, adj_offset, bound);
     }
     pos.ins().trapnz(oob, ir::TrapCode::HeapOutOfBounds);

lib/codegen/src/legalizer/split.rs

@@ -139,7 +139,8 @@ fn split_any(
                 .expect("Branches must have value lists.");
             let num_args = args.len(&pos.func.dfg.value_lists);
             // Get the old value passed to the EBB argument we're repairing.
-            let old_arg = args.get(fixed_args + repair.num, &pos.func.dfg.value_lists)
+            let old_arg = args
+                .get(fixed_args + repair.num, &pos.func.dfg.value_lists)
                 .expect("Too few branch arguments");
 
             // It's possible that the CFG's predecessor list has duplicates. Detect them here.
@@ -153,13 +154,15 @@ fn split_any(
             let (lo, hi) = split_value(pos, old_arg, repair.concat, &mut repairs);
 
             // The `lo` part replaces the original argument.
-            *args.get_mut(fixed_args + repair.num, &mut pos.func.dfg.value_lists)
+            *args
+                .get_mut(fixed_args + repair.num, &mut pos.func.dfg.value_lists)
                 .unwrap() = lo;
 
             // The `hi` part goes at the end. Since multiple repairs may have been scheduled to the
             // same EBB, there could be multiple arguments missing.
             if num_args > fixed_args + repair.hi_num {
-                *args.get_mut(fixed_args + repair.hi_num, &mut pos.func.dfg.value_lists)
+                *args
+                    .get_mut(fixed_args + repair.hi_num, &mut pos.func.dfg.value_lists)
                     .unwrap() = hi;
             } else {
                 // We need to append one or more arguments. If we're adding more than one argument,

lib/codegen/src/postopt.rs

@@ -334,7 +334,8 @@ pub fn do_postopt(func: &mut Function, isa: &TargetIsa) {
                 optimize_cpu_flags(&mut pos, inst, last_flags_clobber, isa);
 
                 // Track the most recent seen instruction that clobbers the flags.
-                if let Some(constraints) = isa.encoding_info()
+                if let Some(constraints) = isa
+                    .encoding_info()
                     .operand_constraints(pos.func.encodings[inst])
                 {
                     if constraints.clobbers_flags {

lib/codegen/src/regalloc/coalescing.rs

@@ -307,7 +307,8 @@ impl<'a> Context<'a> {
         // Create a live range for the new value.
         // TODO: Should we handle ghost values?
         let affinity = Affinity::new(
-            &self.encinfo
+            &self
+                .encinfo
                 .operand_constraints(pos.func.encodings[inst])
                 .expect("Bad copy encoding")
                 .outs[0],
@@ -352,7 +353,8 @@ impl<'a> Context<'a> {
         // Create a live range for the new value.
         // TODO: Handle affinity for ghost values.
         let affinity = Affinity::new(
-            &self.encinfo
+            &self
+                .encinfo
                 .operand_constraints(pos.func.encodings[inst])
                 .expect("Bad copy encoding")
                 .outs[0],
@@ -419,7 +421,8 @@ impl<'a> Context<'a> {
             let node = Node::value(value, 0, self.func);
 
             // Push this value and get the nearest dominating def back.
-            let parent = match self.forest
+            let parent = match self
+                .forest
                 .push_node(node, self.func, self.domtree, self.preorder)
             {
                 None => continue,

lib/codegen/src/regalloc/coloring.rs

@@ -527,7 +527,8 @@ impl<'a> Context<'a> {
     /// all values used by the instruction.
     fn program_complete_input_constraints(&mut self) {
         let inst = self.cur.current_inst().expect("Not on an instruction");
-        let constraints = self.encinfo
+        let constraints = self
+            .encinfo
             .operand_constraints(self.cur.func.encodings[inst])
             .expect("Current instruction not encoded")
             .ins;
@@ -643,7 +644,8 @@ impl<'a> Context<'a> {
         Pred: FnMut(&LiveRange, LiveRangeContext<Layout>) -> bool,
     {
         for rdiv in self.divert.all() {
-            let lr = self.liveness
+            let lr = self
+                .liveness
                 .get(rdiv.value)
                 .expect("Missing live range for diverted register");
             if pred(lr, self.liveness.context(&self.cur.func.layout)) {
@@ -942,7 +944,8 @@ impl<'a> Context<'a> {
                     ..
                 } => {
                     debug_assert_eq!(slot[to_slot].expand(), None, "Overwriting slot in use");
-                    let ss = self.cur
+                    let ss = self
+                        .cur
                         .func
                         .stack_slots
                         .get_emergency_slot(self.cur.func.dfg.value_type(value), &slot[0..spills]);

lib/codegen/src/regalloc/live_value_tracker.rs

@@ -187,7 +187,8 @@ impl LiveValueTracker {
             // If the immediate dominator exits, we must have a stored list for it. This is a
             // requirement to the order EBBs are visited: All dominators must have been processed
             // before the current EBB.
-            let idom_live_list = self.idom_sets
+            let idom_live_list = self
+                .idom_sets
                 .get(&idom)
                 .expect("No stored live set for dominator");
             let ctx = liveness.context(layout);

lib/codegen/src/regalloc/liveness.rs

@@ -340,7 +340,8 @@ impl Liveness {
     where
         PP: Into<ProgramPoint>,
     {
-        let old = self.ranges
+        let old = self
+            .ranges
             .insert(LiveRange::new(value, def.into(), affinity));
         debug_assert!(old.is_none(), "{} already has a live range", value);
     }

lib/codegen/src/regalloc/pressure.rs

@@ -114,7 +114,8 @@ impl Pressure {
         }
 
         // Compute per-class limits from `usable`.
-        for (toprc, rc) in p.toprc
+        for (toprc, rc) in p
+            .toprc
             .iter_mut()
             .take_while(|t| t.num_toprcs > 0)
             .zip(reginfo.classes)

lib/codegen/src/regalloc/reload.rs

@@ -166,7 +166,8 @@ impl<'a> Context<'a> {
                     if arg.affinity.is_stack() {
                         // An incoming register parameter was spilled. Replace the parameter value
                         // with a temporary register value that is immediately spilled.
-                        let reg = self.cur
+                        let reg = self
+                            .cur
                             .func
                             .dfg
                             .replace_ebb_param(arg.value, abi.value_type);
@@ -199,7 +200,8 @@ impl<'a> Context<'a> {
         self.cur.use_srcloc(inst);
 
         // Get the operand constraints for `inst` that we are trying to satisfy.
-        let constraints = self.encinfo
+        let constraints = self
+            .encinfo
             .operand_constraints(encoding)
             .expect("Missing instruction encoding");
 
@@ -276,7 +278,8 @@ impl<'a> Context<'a> {
         // Same thing for spilled call return values.
         let retvals = &defs[constraints.outs.len()..];
         if !retvals.is_empty() {
-            let sig = self.cur
+            let sig = self
+                .cur
                 .func
                 .dfg
                 .call_signature(inst)

lib/codegen/src/regalloc/spilling.rs

@@ -125,7 +125,8 @@ impl<'a> Context<'a> {
         self.process_spills(tracker);
 
         while let Some(inst) = self.cur.next_inst() {
-            if let Some(constraints) = self.encinfo
+            if let Some(constraints) = self
+                .encinfo
                 .operand_constraints(self.cur.func.encodings[inst])
             {
                 self.visit_inst(inst, ebb, constraints, tracker);
@@ -494,7 +495,8 @@ impl<'a> Context<'a> {
         }
 
         // Assign a spill slot for the whole virtual register.
-        let ss = self.cur
+        let ss = self
+            .cur
             .func
             .stack_slots
             .make_spill_slot(self.cur.func.dfg.value_type(value));

lib/codegen/src/regalloc/virtregs.rs

@@ -152,7 +152,8 @@ impl VirtRegs {
         });
 
         // Determine the insertion position for `single`.
-        let index = match self.values(vreg)
+        let index = match self
+            .values(vreg)
             .binary_search_by(|&v| preorder.pre_cmp_def(v, single, func))
         {
             Ok(_) => panic!("{} already in {}", single, vreg),

lib/codegen/src/stack_layout.rs

@@ -49,7 +49,8 @@ pub fn layout_stack(frame: &mut StackSlots, alignment: StackSize) -> CodegenResu
                 incoming_min = min(incoming_min, slot.offset.unwrap());
             }
             StackSlotKind::OutgoingArg => {
-                let offset = slot.offset
+                let offset = slot
+                    .offset
                     .unwrap()
                     .checked_add(slot.size as StackOffset)
                     .ok_or(CodegenError::ImplLimitExceeded)?;

lib/codegen/src/verifier/flags.rs

@@ -98,7 +98,8 @@ impl<'a> FlagsVerifier<'a> {
                 }
 
                 // Does the instruction have an encoding that clobbers the CPU flags?
-                if self.encinfo
+                if self
+                    .encinfo
                     .as_ref()
                     .and_then(|ei| ei.operand_constraints(self.func.encodings[inst]))
                     .map_or(false, |c| c.clobbers_flags) && live_val.is_some()

lib/codegen/src/verifier/locations.rs

@@ -87,7 +87,8 @@ impl<'a> LocationVerifier<'a> {
         enc: isa::Encoding,
         divert: &RegDiversions,
     ) -> VerifierResult<()> {
-        let constraints = self.encinfo
+        let constraints = self
+            .encinfo
             .operand_constraints(enc)
             .expect("check_enc_constraints requires a legal encoding");
 

lib/codegen/src/verifier/mod.rs

@@ -191,7 +191,8 @@ impl<'a> Verifier<'a> {
             }
 
             if let ir::GlobalValueData::VMContext { .. } = self.func.global_values[cur] {
-                if self.func
+                if self
+                    .func
                     .special_param(ir::ArgumentPurpose::VMContext)
                     .is_none()
                 {
@@ -253,7 +254,8 @@ impl<'a> Verifier<'a> {
 
         let fixed_results = inst_data.opcode().constraints().fixed_results();
         // var_results is 0 if we aren't a call instruction
-        let var_results = dfg.call_signature(inst)
+        let var_results = dfg
+            .call_signature(inst)
             .map_or(0, |sig| dfg.signatures[sig].returns.len());
         let total_results = fixed_results + var_results;
 
@@ -498,7 +500,8 @@ impl<'a> Verifier<'a> {
                 }
                 // Defining instruction dominates the instruction that uses the value.
                 if is_reachable {
-                    if !self.expected_domtree
+                    if !self
+                        .expected_domtree
                         .dominates(def_inst, loc_inst, &self.func.layout)
                     {
                         return err!(loc_inst, "uses value from non-dominating {}", def_inst);
@@ -529,7 +532,8 @@ impl<'a> Verifier<'a> {
                 }
                 // The defining EBB dominates the instruction using this value.
                 if is_reachable
-                    && !self.expected_domtree
+                    && !self
+                        .expected_domtree
                         .dominates(ebb, loc_inst, &self.func.layout)
                 {
                     return err!(loc_inst, "uses value arg from non-dominating {}", ebb);
@@ -604,7 +608,8 @@ impl<'a> Verifier<'a> {
         }
         // We verify rpo_cmp on pairs of adjacent ebbs in the postorder
         for (&prev_ebb, &next_ebb) in domtree.cfg_postorder().iter().adjacent_pairs() {
-            if self.expected_domtree
+            if self
+                .expected_domtree
                 .rpo_cmp(prev_ebb, next_ebb, &self.func.layout) != Ordering::Greater
             {
                 return err!(
@@ -743,7 +748,8 @@ impl<'a> Verifier<'a> {
     fn typecheck_variable_args(&self, inst: Inst) -> VerifierResult<()> {
         match self.func.dfg.analyze_branch(inst) {
             BranchInfo::SingleDest(ebb, _) => {
-                let iter = self.func
+                let iter = self
+                    .func
                     .dfg
                     .ebb_params(ebb)
                     .iter()
@@ -1038,7 +1044,8 @@ impl<'a> Verifier<'a> {
 
         let encoding = self.func.encodings[inst];
         if encoding.is_legal() {
-            let mut encodings = isa.legal_encodings(
+            let mut encodings =
+                isa.legal_encodings(
                     &self.func,
                     &self.func.dfg[inst],
                     self.func.dfg.ctrl_typevar(inst),

lib/filetests/src/runner.rs

@@ -282,7 +282,8 @@ impl TestRunner {
     /// Print out a report of slow tests.
     fn report_slow_tests(&self) {
         // Collect runtimes of succeeded tests.
-        let mut times = self.tests
+        let mut times = self
+            .tests
             .iter()
             .filter_map(|entry| match *entry {
                 QueueEntry {

lib/filetests/src/test_binemit.rs

@@ -116,7 +116,8 @@ impl SubTest for TestBinEmit {
         let mut func = func.into_owned();
 
         // Fix the stack frame layout so we can test spill/fill encodings.
-        let min_offset = func.stack_slots
+        let min_offset = func
+            .stack_slots
             .values()
             .map(|slot| slot.offset.unwrap())
             .min();
@@ -133,11 +134,9 @@ impl SubTest for TestBinEmit {
                     // Find an encoding that satisfies both immediate field and register
                     // constraints.
                     if let Some(enc) = {
-                        let mut legal_encodings = isa.legal_encodings(
+                        let mut legal_encodings = isa
-                            &func,
+                            .legal_encodings(&func, &func.dfg[inst], func.dfg.ctrl_typevar(inst))
-                            &func.dfg[inst],
+                            .filter(|e| {
-                            func.dfg.ctrl_typevar(inst),
-                        ).filter(|e| {
                                 let recipe_constraints = &encinfo.constraints[e.recipe()];
                                 recipe_constraints.satisfied(inst, &divert, &func)
                             });
@@ -207,7 +206,8 @@ impl SubTest for TestBinEmit {
                 // Send legal encodings into the emitter.
                 if enc.is_legal() {
                     // Generate a better error message if output locations are not specified.
-                    if let Some(&v) = func.dfg
+                    if let Some(&v) = func
+                        .dfg
                         .inst_results(inst)
                         .iter()
                         .find(|&&v| !func.locations[v].is_assigned())
@@ -236,7 +236,8 @@ impl SubTest for TestBinEmit {
                     if !enc.is_legal() {
                         // A possible cause of an unencoded instruction is a missing location for
                         // one of the input operands.
-                        if let Some(&v) = func.dfg
+                        if let Some(&v) = func
+                            .dfg
                             .inst_args(inst)
                             .iter()
                             .find(|&&v| !func.locations[v].is_assigned())
@@ -249,11 +250,9 @@ impl SubTest for TestBinEmit {
                         }
 
                         // Do any encodings exist?
-                        let encodings = isa.legal_encodings(
+                        let encodings = isa
-                            &func,
+                            .legal_encodings(&func, &func.dfg[inst], func.dfg.ctrl_typevar(inst))
-                            &func.dfg[inst],
+                            .map(|e| encinfo.display(e))
-                            func.dfg.ctrl_typevar(inst),
-                        ).map(|e| encinfo.display(e))
                             .collect::<Vec<_>>();
 
                         if encodings.is_empty() {

lib/filetests/src/test_domtree.rs

@@ -93,7 +93,8 @@ impl SubTest for TestDomtree {
 
         // Now we know that everything in `expected` is consistent with `domtree`.
         // All other EBB's should be either unreachable or the entry block.
-        for ebb in func.layout
+        for ebb in func
+            .layout
             .ebbs()
             .skip(1)
             .filter(|ebb| !expected.contains_key(ebb))

lib/frontend/src/frontend.rs

@@ -167,7 +167,8 @@ where
                         // capable of having the same successor appear
                         // multiple times, so we must deduplicate.
                         let mut unique = EntitySet::<Ebb>::new();
-                        for dest_ebb in self.builder
+                        for dest_ebb in self
+                            .builder
                             .func
                             .jump_tables
                             .get(table)
@@ -544,7 +545,8 @@ where
             Some(entry) => self.position.ebb.unwrap() == entry,
         };
         !is_entry && self.func_ctx.ssa.is_sealed(self.position.ebb.unwrap())
-            && !self.func_ctx
+            && !self
+                .func_ctx
                 .ssa
                 .has_any_predecessors(self.position.ebb.unwrap())
     }

lib/frontend/src/ssa.rs

@@ -103,7 +103,8 @@ impl<Variable> BlockData<Variable> {
             BlockData::EbbHeader(ref mut data) => {
                 // This a linear complexity operation but the number of predecessors is low
                 // in all non-pathological cases
-                let pred: usize = data.predecessors
+                let pred: usize = data
+                    .predecessors
                     .iter()
                     .position(|&PredBlock { branch, .. }| branch == inst)
                     .expect("the predecessor you are trying to remove is not declared");
@@ -597,7 +598,8 @@ where
                 } in &mut preds
                 {
                     // We already did a full `use_var` above, so we can do just the fast path.
-                    let pred_val = self.variables
+                    let pred_val = self
+                        .variables
                         .get(temp_arg_var)
                         .unwrap()
                         .get(*pred_block)

lib/module/src/module.rs

@@ -526,7 +526,8 @@ where
             "imported data cannot contain references"
         );
         self.backend.write_data_funcaddr(
-            &mut info.compiled
+            &mut info
+                .compiled
                 .as_mut()
                 .expect("`data` must refer to a defined data object"),
             offset,
@@ -549,7 +550,8 @@ where
             "imported data cannot contain references"
         );
         self.backend.write_data_dataaddr(
-            &mut info.compiled
+            &mut info
+                .compiled
                 .as_mut()
                 .expect("`data` must refer to a defined data object"),
             offset,

lib/reader/src/parser.rs

@@ -644,10 +644,12 @@ impl<'a> Parser<'a> {
         if let Some(Token::Name(name)) = self.token() {
             self.consume();
             match isa {
-                Some(isa) => isa.register_info()
+                Some(isa) => isa
+                    .register_info()
                     .parse_regunit(name)
                     .ok_or_else(|| self.error("invalid register name")),
-                None => name.parse()
+                None => name
+                    .parse()
                     .map_err(|_| self.error("invalid register number")),
             }
         } else {
@@ -1032,7 +1034,8 @@ impl<'a> Parser<'a> {
                     self.parse_jump_table_decl()
                         .and_then(|(jt, dat)| ctx.add_jt(jt, dat, self.loc))
                 }
-                Some(Token::Identifier("stack_limit")) => self.parse_stack_limit_decl()
+                Some(Token::Identifier("stack_limit")) => self
+                    .parse_stack_limit_decl()
                     .and_then(|gv| ctx.set_stack_limit(gv, self.loc)),
                 // More to come..
                 _ => return Ok(()),
@@ -1053,7 +1056,8 @@ impl<'a> Parser<'a> {
         let kind = self.match_enum("expected stack slot kind")?;
 
         // stack-slot-decl ::= StackSlot(ss) "=" stack-slot-kind * Bytes {"," stack-slot-flag}
-        let bytes: i64 = self.match_imm64("expected byte-size in stack_slot decl")?
+        let bytes: i64 = self
+            .match_imm64("expected byte-size in stack_slot decl")?
             .into();
         if bytes < 0 {
             return err!(self.loc, "negative stack slot size");
@@ -1708,7 +1712,8 @@ impl<'a> Parser<'a> {
         }
 
         if let Some(result_locations) = result_locations {
-            for (&value, loc) in ctx.function
+            for (&value, loc) in ctx
+                .function
                 .dfg
                 .inst_results(inst)
                 .iter()

lib/simplejit/src/backend.rs

@@ -122,7 +122,8 @@ impl<'simple_jit_backend> Backend for SimpleJITBackend {
         code_size: u32,
     ) -> ModuleResult<Self::CompiledFunction> {
         let size = code_size as usize;
-        let ptr = self.code_memory
+        let ptr = self
+            .code_memory
             .allocate(size)
             .expect("TODO: handle OOM etc.");
         let mut reloc_sink = SimpleJITRelocSink::new();
@@ -155,10 +156,12 @@ impl<'simple_jit_backend> Backend for SimpleJITBackend {
 
         let size = init.size();
         let storage = match writable {
-            Writability::Readonly => self.writable_memory
+            Writability::Readonly => self
+                .writable_memory
                 .allocate(size)
                 .expect("TODO: handle OOM etc."),
-            Writability::Writable => self.writable_memory
+            Writability::Writable => self
+                .writable_memory
                 .allocate(size)
                 .expect("TODO: handle OOM etc."),
         };

lib/wasm/src/environ/dummy.rs

@@ -210,7 +210,8 @@ impl<'dummy_environment> FuncEnvironment for DummyFuncEnvironment<'dummy_environ
         call_args: &[ir::Value],
     ) -> WasmResult<ir::Inst> {
         // Pass the current function's vmctx parameter on to the callee.
-        let vmctx = pos.func
+        let vmctx = pos
+            .func
             .special_param(ir::ArgumentPurpose::VMContext)
             .expect("Missing vmctx parameter");
 
@@ -236,7 +237,8 @@ impl<'dummy_environment> FuncEnvironment for DummyFuncEnvironment<'dummy_environ
         args.extend(call_args.iter().cloned(), &mut pos.func.dfg.value_lists);
         args.push(vmctx, &mut pos.func.dfg.value_lists);
 
-        Ok(pos.ins()
+        Ok(pos
+            .ins()
             .CallIndirect(ir::Opcode::CallIndirect, VOID, sig_ref, args)
             .0)
     }
@@ -249,7 +251,8 @@ impl<'dummy_environment> FuncEnvironment for DummyFuncEnvironment<'dummy_environ
         call_args: &[ir::Value],
     ) -> WasmResult<ir::Inst> {
         // Pass the current function's vmctx parameter on to the callee.
-        let vmctx = pos.func
+        let vmctx = pos
+            .func
             .special_param(ir::ArgumentPurpose::VMContext)
             .expect("Missing vmctx parameter");
 

lib/wasm/src/func_translator.rs

@@ -248,10 +248,8 @@ mod tests {
         // )
         const BODY: [u8; 7] = [
             0x00, // local decl count
-            0x20,
+            0x20, 0x00, // get_local 0
-            0x00, // get_local 0
+            0x41, 0x01, // i32.const 1
-            0x41,
-            0x01, // i32.const 1
             0x6a, // i32.add
             0x0b, // end
         ];
@@ -280,10 +278,8 @@ mod tests {
         // )
         const BODY: [u8; 8] = [
             0x00, // local decl count
-            0x20,
+            0x20, 0x00, // get_local 0
-            0x00, // get_local 0
+            0x41, 0x01, // i32.const 1
-            0x41,
-            0x01, // i32.const 1
             0x6a, // i32.add
             0x0f, // return
             0x0b, // end
@@ -318,19 +314,13 @@ mod tests {
         // )
         const BODY: [u8; 16] = [
             0x01, // 1 local decl.
-            0x01,
+            0x01, 0x7f, // 1 i32 local.
-            0x7f, // 1 i32 local.
+            0x03, 0x7f, // loop i32
-            0x03,
+            0x20, 0x00, // get_local 0
-            0x7f, // loop i32
+            0x41, 0x01, // i32.const 0
-            0x20,
-            0x00, // get_local 0
-            0x41,
-            0x01, // i32.const 0
             0x6a, // i32.add
-            0x21,
+            0x21, 0x00, // set_local 0
-            0x00, // set_local 0
+            0x0c, 0x00, // br 0
-            0x0c,
-            0x00, // br 0
             0x0b, // end
             0x0b, // end
         ];

lib/wasm/src/sections_translator.rs

@@ -412,9 +412,11 @@ pub fn parse_code_section<'data>(
         }
         let mut reader = parser.create_binary_reader();
         let size = reader.bytes_remaining();
-        environ.define_function_body(reader
+        environ.define_function_body(
+            reader
                 .read_bytes(size)
-            .map_err(WasmError::from_binary_reader_error)?)?;
+                .map_err(WasmError::from_binary_reader_error)?,
+        )?;
     }
     Ok(())
 }

lib/wasm/src/state.rs

@@ -282,7 +282,8 @@ impl TranslationState {
         environ: &mut FE,
     ) -> GlobalVariable {
         let index = index as GlobalIndex;
-        *self.globals
+        *self
+            .globals
             .entry(index)
             .or_insert_with(|| environ.make_global(func, index))
     }
@@ -296,7 +297,8 @@ impl TranslationState {
         environ: &mut FE,
     ) -> ir::Heap {
         let index = index as MemoryIndex;
-        *self.heaps
+        *self
+            .heaps
             .entry(index)
             .or_insert_with(|| environ.make_heap(func, index))
     }