Various pattern cleanups

compiler/rustc_ast/src/mut_visit.rs

@@ -1179,13 +1179,10 @@ fn noop_visit_inline_asm<T: MutVisitor>(asm: &mut InlineAsm, vis: &mut T) {
     for (op, _) in &mut asm.operands {
         match op {
             InlineAsmOperand::In { expr, .. }
+            | InlineAsmOperand::Out { expr: Some(expr), .. }
             | InlineAsmOperand::InOut { expr, .. }
             | InlineAsmOperand::Sym { expr, .. } => vis.visit_expr(expr),
-            InlineAsmOperand::Out { expr, .. } => {
-                if let Some(expr) = expr {
-                    vis.visit_expr(expr);
-                }
-            }
+            InlineAsmOperand::Out { expr: None, .. } => {}
             InlineAsmOperand::SplitInOut { in_expr, out_expr, .. } => {
                 vis.visit_expr(in_expr);
                 if let Some(out_expr) = out_expr {

compiler/rustc_ast/src/visit.rs

@@ -714,13 +714,10 @@ fn walk_inline_asm<'a, V: Visitor<'a>>(visitor: &mut V, asm: &'a InlineAsm) {
     for (op, _) in &asm.operands {
         match op {
             InlineAsmOperand::In { expr, .. }
+            | InlineAsmOperand::Out { expr: Some(expr), .. }
             | InlineAsmOperand::InOut { expr, .. }
             | InlineAsmOperand::Sym { expr, .. } => visitor.visit_expr(expr),
-            InlineAsmOperand::Out { expr, .. } => {
-                if let Some(expr) = expr {
-                    visitor.visit_expr(expr);
-                }
-            }
+            InlineAsmOperand::Out { expr: None, .. } => {}
             InlineAsmOperand::SplitInOut { in_expr, out_expr, .. } => {
                 visitor.visit_expr(in_expr);
                 if let Some(out_expr) = out_expr {

compiler/rustc_expand/src/lib.rs

+#![cfg_attr(bootstrap, feature(bindings_after_at))]
 #![feature(crate_visibility_modifier)]
 #![feature(decl_macro)]
 #![feature(destructuring_assignment)]

compiler/rustc_middle/src/mir/mod.rs

@@ -1664,13 +1664,10 @@ fn fmt(&self, fmt: &mut Formatter<'_>) -> fmt::Result {
             AscribeUserType(box (ref place, ref c_ty), ref variance) => {
                 write!(fmt, "AscribeUserType({:?}, {:?}, {:?})", place, variance, c_ty)
             }
-            Coverage(box ref coverage) => {
-                if let Some(rgn) = &coverage.code_region {
-                    write!(fmt, "Coverage::{:?} for {:?}", coverage.kind, rgn)
-                } else {
-                    write!(fmt, "Coverage::{:?}", coverage.kind)
-                }
+            Coverage(box self::Coverage { ref kind, code_region: Some(ref rgn) }) => {
+                write!(fmt, "Coverage::{:?} for {:?}", kind, rgn)
             }
+            Coverage(box ref coverage) => write!(fmt, "Coverage::{:?}", coverage.kind),
             CopyNonOverlapping(box crate::mir::CopyNonOverlapping {
                 ref src,
                 ref dst,

compiler/rustc_middle/src/mir/visit.rs

@@ -587,14 +587,12 @@ fn super_terminator(&mut self,
                                 InlineAsmOperand::In { value, .. } => {
                                     self.visit_operand(value, location);
                                 }
-                                InlineAsmOperand::Out { place, .. } => {
-                                    if let Some(place) = place {
-                                        self.visit_place(
-                                            place,
-                                            PlaceContext::MutatingUse(MutatingUseContext::Store),
-                                            location,
-                                        );
-                                    }
+                                InlineAsmOperand::Out { place: Some(place), .. } => {
+                                    self.visit_place(
+                                        place,
+                                        PlaceContext::MutatingUse(MutatingUseContext::Store),
+                                        location,
+                                    );
                                 }
                                 InlineAsmOperand::InOut { in_value, out_place, .. } => {
                                     self.visit_operand(in_value, location);
@@ -610,7 +608,8 @@ fn super_terminator(&mut self,
                                 | InlineAsmOperand::SymFn { value } => {
                                     self.visit_constant(value, location);
                                 }
-                                InlineAsmOperand::SymStatic { def_id: _ } => {}
+                                InlineAsmOperand::Out { place: None, .. }
+                                | InlineAsmOperand::SymStatic { def_id: _ } => {}
                             }
                         }
                     }

compiler/rustc_middle/src/thir.rs

@@ -14,7 +14,7 @@
 use rustc_hir::def_id::DefId;
 use rustc_hir::RangeEnd;
 use rustc_index::newtype_index;
-use rustc_index::vec::{Idx, IndexVec};
+use rustc_index::vec::IndexVec;
 use rustc_middle::infer::canonical::Canonical;
 use rustc_middle::middle::region;
 use rustc_middle::mir::{
@@ -716,17 +716,9 @@ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
                     PatKind::Variant { adt_def, variant_index, .. } => {
                         Some(&adt_def.variants[variant_index])
                     }
-                    _ => {
-                        if let ty::Adt(adt, _) = self.ty.kind() {
-                            if !adt.is_enum() {
-                                Some(&adt.variants[VariantIdx::new(0)])
-                            } else {
-                                None
-                            }
-                        } else {
-                            None
-                        }
-                    }
+                    _ => self.ty.ty_adt_def().and_then(|adt| {
+                        if !adt.is_enum() { Some(adt.non_enum_variant()) } else { None }
+                    }),
                 };
 
                 if let Some(variant) = variant {

compiler/rustc_middle/src/ty/print/pretty.rs

@@ -927,27 +927,29 @@ fn pretty_print_const(
         }
 
         match ct.val {
-            ty::ConstKind::Unevaluated(ty::Unevaluated { def, substs, promoted }) => {
-                if let Some(promoted) = promoted {
-                    p!(print_value_path(def.did, substs));
-                    p!(write("::{:?}", promoted));
-                } else {
-                    match self.tcx().def_kind(def.did) {
-                        DefKind::Static | DefKind::Const | DefKind::AssocConst => {
-                            p!(print_value_path(def.did, substs))
-                        }
-                        _ => {
-                            if def.is_local() {
-                                let span = self.tcx().def_span(def.did);
-                                if let Ok(snip) = self.tcx().sess.source_map().span_to_snippet(span)
-                                {
-                                    p!(write("{}", snip))
-                                } else {
-                                    print_underscore!()
-                                }
+            ty::ConstKind::Unevaluated(ty::Unevaluated {
+                def,
+                substs,
+                promoted: Some(promoted),
+            }) => {
+                p!(print_value_path(def.did, substs));
+                p!(write("::{:?}", promoted));
+            }
+            ty::ConstKind::Unevaluated(ty::Unevaluated { def, substs, promoted: None }) => {
+                match self.tcx().def_kind(def.did) {
+                    DefKind::Static | DefKind::Const | DefKind::AssocConst => {
+                        p!(print_value_path(def.did, substs))
+                    }
+                    _ => {
+                        if def.is_local() {
+                            let span = self.tcx().def_span(def.did);
+                            if let Ok(snip) = self.tcx().sess.source_map().span_to_snippet(span) {
+                                p!(write("{}", snip))
                             } else {
                                 print_underscore!()
                             }
+                        } else {
+                            print_underscore!()
                         }
                     }
                 }

compiler/rustc_typeck/src/check/expr.rs

@@ -2164,14 +2164,11 @@ fn check_expr_asm(&self, asm: &'tcx hir::InlineAsm<'tcx>) -> Ty<'tcx> {
                 hir::InlineAsmOperand::In { expr, .. } => {
                     self.check_expr_asm_operand(expr, true);
                 }
-                hir::InlineAsmOperand::Out { expr, .. } => {
-                    if let Some(expr) = expr {
-                        self.check_expr_asm_operand(expr, false);
-                    }
-                }
-                hir::InlineAsmOperand::InOut { expr, .. } => {
+                hir::InlineAsmOperand::Out { expr: Some(expr), .. }
+                | hir::InlineAsmOperand::InOut { expr, .. } => {
                     self.check_expr_asm_operand(expr, false);
                 }
+                hir::InlineAsmOperand::Out { expr: None, .. } => {}
                 hir::InlineAsmOperand::SplitInOut { in_expr, out_expr, .. } => {
                     self.check_expr_asm_operand(in_expr, true);
                     if let Some(out_expr) = out_expr {

compiler/rustc_typeck/src/expr_use_visitor.rs

@@ -334,12 +334,8 @@ pub fn walk_expr(&mut self, expr: &hir::Expr<'_>) {
                     match op {
                         hir::InlineAsmOperand::In { expr, .. }
                         | hir::InlineAsmOperand::Sym { expr, .. } => self.consume_expr(expr),
-                        hir::InlineAsmOperand::Out { expr, .. } => {
-                            if let Some(expr) = expr {
-                                self.mutate_expr(expr);
-                            }
-                        }
-                        hir::InlineAsmOperand::InOut { expr, .. } => {
+                        hir::InlineAsmOperand::Out { expr: Some(expr), .. }
+                        | hir::InlineAsmOperand::InOut { expr, .. } => {
                             self.mutate_expr(expr);
                         }
                         hir::InlineAsmOperand::SplitInOut { in_expr, out_expr, .. } => {
@@ -348,7 +344,8 @@ pub fn walk_expr(&mut self, expr: &hir::Expr<'_>) {
                                 self.mutate_expr(out_expr);
                             }
                         }
-                        hir::InlineAsmOperand::Const { .. } => {}
+                        hir::InlineAsmOperand::Out { expr: None, .. }
+                        | hir::InlineAsmOperand::Const { .. } => {}
                     }
                 }
             }