Rollup merge of rust-lang#69179 - JohnTitor:rename-to-fnretty, r=Centril

Rename `FunctionRetTy` to `FnRetTy`

As per FIXME comment

r? @Centril

src/librustc/infer/error_reporting/need_type_info.rs

@@ -7,7 +7,7 @@ use rustc_errors::{struct_span_err, Applicability, DiagnosticBuilder};
 use rustc_hir as hir;
 use rustc_hir::def::{DefKind, Namespace};
 use rustc_hir::intravisit::{self, NestedVisitorMap, Visitor};
-use rustc_hir::{Body, Expr, ExprKind, FunctionRetTy, HirId, Local, Pat};
+use rustc_hir::{Body, Expr, ExprKind, FnRetTy, HirId, Local, Pat};
 use rustc_span::source_map::DesugaringKind;
 use rustc_span::symbol::kw;
 use rustc_span::Span;
@@ -108,7 +108,7 @@ impl<'a, 'tcx> Visitor<'tcx> for FindLocalByTypeVisitor<'a, 'tcx> {
 fn closure_return_type_suggestion(
     span: Span,
     err: &mut DiagnosticBuilder<'_>,
-    output: &FunctionRetTy<'_>,
+    output: &FnRetTy<'_>,
     body: &Body<'_>,
     descr: &str,
     name: &str,
@@ -117,7 +117,7 @@ fn closure_return_type_suggestion(
     parent_descr: Option<&str>,
 ) {
     let (arrow, post) = match output {
-        FunctionRetTy::DefaultReturn(_) => ("-> ", " "),
+        FnRetTy::DefaultReturn(_) => ("-> ", " "),
         _ => ("", ""),
     };
     let suggestion = match body.value.kind {

src/librustc/infer/error_reporting/nice_region_error/named_anon_conflict.rs

@@ -3,7 +3,7 @@
 use crate::infer::error_reporting::nice_region_error::NiceRegionError;
 use crate::ty;
 use rustc_errors::{struct_span_err, Applicability, DiagnosticBuilder};
-use rustc_hir::{FunctionRetTy, TyKind};
+use rustc_hir::{FnRetTy, TyKind};
 
 impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
     /// When given a `ConcreteFailure` for a function with parameters containing a named region and
@@ -79,7 +79,7 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
             {
                 return None;
             }
-            if let FunctionRetTy::Return(ty) = &fndecl.output {
+            if let FnRetTy::Return(ty) = &fndecl.output {
                 if let (TyKind::Def(_, _), ty::ReStatic) = (&ty.kind, sub) {
                     // This is an impl Trait return that evaluates de need of 'static.
                     // We handle this case better in `static_impl_trait`.

src/librustc/traits/error_reporting/suggestions.rs

@@ -593,7 +593,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
             _ => return false,
         };
 
-        let ret_ty = if let hir::FunctionRetTy::Return(ret_ty) = sig.decl.output {
+        let ret_ty = if let hir::FnRetTy::Return(ret_ty) = sig.decl.output {
             ret_ty
         } else {
             return false;

src/librustc_ast_lowering/expr.rs

@@ -480,8 +480,8 @@ impl<'hir> LoweringContext<'_, 'hir> {
         body: impl FnOnce(&mut Self) -> hir::Expr<'hir>,
     ) -> hir::ExprKind<'hir> {
         let output = match ret_ty {
-            Some(ty) => FunctionRetTy::Ty(ty),
-            None => FunctionRetTy::Default(span),
+            Some(ty) => FnRetTy::Ty(ty),
+            None => FnRetTy::Default(span),
         };
         let ast_decl = FnDecl { inputs: vec![], output };
         let decl = self.lower_fn_decl(&ast_decl, None, /* impl trait allowed */ false, None);
@@ -721,7 +721,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
         fn_decl_span: Span,
     ) -> hir::ExprKind<'hir> {
         let outer_decl =
-            FnDecl { inputs: decl.inputs.clone(), output: FunctionRetTy::Default(fn_decl_span) };
+            FnDecl { inputs: decl.inputs.clone(), output: FnRetTy::Default(fn_decl_span) };
         // We need to lower the declaration outside the new scope, because we
         // have to conserve the state of being inside a loop condition for the
         // closure argument types.
@@ -747,7 +747,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
             // `|x: u8| future_from_generator(|| -> X { ... })`.
             let body_id = this.lower_fn_body(&outer_decl, |this| {
                 let async_ret_ty =
-                    if let FunctionRetTy::Ty(ty) = &decl.output { Some(ty.clone()) } else { None };
+                    if let FnRetTy::Ty(ty) = &decl.output { Some(ty.clone()) } else { None };
                 let async_body = this.make_async_expr(
                     capture_clause,
                     closure_id,

src/librustc_ast_lowering/lib.rs

@@ -1723,16 +1723,16 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
             )
         } else {
             match decl.output {
-                FunctionRetTy::Ty(ref ty) => {
+                FnRetTy::Ty(ref ty) => {
                     let context = match in_band_ty_params {
                         Some((def_id, _)) if impl_trait_return_allow => {
                             ImplTraitContext::OpaqueTy(Some(def_id), hir::OpaqueTyOrigin::FnReturn)
                         }
                         _ => ImplTraitContext::disallowed(),
                     };
-                    hir::FunctionRetTy::Return(self.lower_ty(ty, context))
+                    hir::FnRetTy::Return(self.lower_ty(ty, context))
                 }
-                FunctionRetTy::Default(span) => hir::FunctionRetTy::DefaultReturn(span),
+                FnRetTy::Default(span) => hir::FnRetTy::DefaultReturn(span),
             }
         };
 
@@ -1779,10 +1779,10 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
     // `elided_lt_replacement`: replacement for elided lifetimes in the return type
     fn lower_async_fn_ret_ty(
         &mut self,
-        output: &FunctionRetTy,
+        output: &FnRetTy,
         fn_def_id: DefId,
         opaque_ty_node_id: NodeId,
-    ) -> hir::FunctionRetTy<'hir> {
+    ) -> hir::FnRetTy<'hir> {
         debug!(
             "lower_async_fn_ret_ty(\
              output={:?}, \
@@ -1947,27 +1947,27 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         // only the lifetime parameters that we must supply.
         let opaque_ty_ref = hir::TyKind::Def(hir::ItemId { id: opaque_ty_id }, generic_args);
         let opaque_ty = self.ty(opaque_ty_span, opaque_ty_ref);
-        hir::FunctionRetTy::Return(self.arena.alloc(opaque_ty))
+        hir::FnRetTy::Return(self.arena.alloc(opaque_ty))
     }
 
     /// Transforms `-> T` into `Future<Output = T>`
     fn lower_async_fn_output_type_to_future_bound(
         &mut self,
-        output: &FunctionRetTy,
+        output: &FnRetTy,
         fn_def_id: DefId,
         span: Span,
     ) -> hir::GenericBound<'hir> {
         // Compute the `T` in `Future<Output = T>` from the return type.
         let output_ty = match output {
-            FunctionRetTy::Ty(ty) => {
+            FnRetTy::Ty(ty) => {
                 // Not `OpaqueTyOrigin::AsyncFn`: that's only used for the
                 // `impl Future` opaque type that `async fn` implicitly
                 // generates.
                 let context =
                     ImplTraitContext::OpaqueTy(Some(fn_def_id), hir::OpaqueTyOrigin::FnReturn);
                 self.lower_ty(ty, context)
             }
-            FunctionRetTy::Default(ret_ty_span) => self.arena.alloc(self.ty_tup(*ret_ty_span, &[])),
+            FnRetTy::Default(ret_ty_span) => self.arena.alloc(self.ty_tup(*ret_ty_span, &[])),
         };
 
         // "<Output = T>"

src/librustc_ast_lowering/path.rs

@@ -397,8 +397,8 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                 inputs.iter().map(|ty| this.lower_ty_direct(ty, ImplTraitContext::disallowed())),
             );
             let output_ty = match output {
-                FunctionRetTy::Ty(ty) => this.lower_ty(&ty, ImplTraitContext::disallowed()),
-                FunctionRetTy::Default(_) => this.arena.alloc(this.ty_tup(span, &[])),
+                FnRetTy::Ty(ty) => this.lower_ty(&ty, ImplTraitContext::disallowed()),
+                FnRetTy::Default(_) => this.arena.alloc(this.ty_tup(span, &[])),
             };
             let args = smallvec![GenericArg::Type(this.ty_tup(span, inputs))];
             let binding = this.output_ty_binding(output_ty.span, output_ty);

src/librustc_ast_passes/ast_validation.rs

@@ -954,7 +954,7 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
             }
             GenericArgs::Parenthesized(ref data) => {
                 walk_list!(self, visit_ty, &data.inputs);
-                if let FunctionRetTy::Ty(ty) = &data.output {
+                if let FnRetTy::Ty(ty) = &data.output {
                     // `-> Foo` syntax is essentially an associated type binding,
                     // so it is also allowed to contain nested `impl Trait`.
                     self.with_impl_trait(None, |this| this.visit_ty(ty));

src/librustc_ast_passes/feature_gate.rs

@@ -419,8 +419,8 @@ impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
         visit::walk_ty(self, ty)
     }
 
-    fn visit_fn_ret_ty(&mut self, ret_ty: &'a ast::FunctionRetTy) {
-        if let ast::FunctionRetTy::Ty(ref output_ty) = *ret_ty {
+    fn visit_fn_ret_ty(&mut self, ret_ty: &'a ast::FnRetTy) {
+        if let ast::FnRetTy::Ty(ref output_ty) = *ret_ty {
             if let ast::TyKind::Never = output_ty.kind {
                 // Do nothing.
             } else {

src/librustc_ast_pretty/pprust.rs

@@ -2673,8 +2673,8 @@ impl<'a> State<'a> {
         self.end();
     }
 
-    crate fn print_fn_ret_ty(&mut self, fn_ret_ty: &ast::FunctionRetTy) {
-        if let ast::FunctionRetTy::Ty(ty) = fn_ret_ty {
+    crate fn print_fn_ret_ty(&mut self, fn_ret_ty: &ast::FnRetTy) {
+        if let ast::FnRetTy::Ty(ty) = fn_ret_ty {
             self.space_if_not_bol();
             self.ibox(INDENT_UNIT);
             self.word_space("->");

src/librustc_ast_pretty/pprust/tests.rs

@@ -34,10 +34,8 @@ fn test_fun_to_string() {
     with_default_globals(|| {
         let abba_ident = ast::Ident::from_str("abba");
 
-        let decl = ast::FnDecl {
-            inputs: Vec::new(),
-            output: ast::FunctionRetTy::Default(rustc_span::DUMMY_SP),
-        };
+        let decl =
+            ast::FnDecl { inputs: Vec::new(), output: ast::FnRetTy::Default(rustc_span::DUMMY_SP) };
         let generics = ast::Generics::default();
         assert_eq!(
             fun_to_string(&decl, ast::FnHeader::default(), abba_ident, &generics),

src/librustc_builtin_macros/deriving/generic/mod.rs

@@ -957,7 +957,7 @@ impl<'a> MethodDef<'a> {
         let ret_type = self.get_ret_ty(cx, trait_, generics, type_ident);
 
         let method_ident = cx.ident_of(self.name, trait_.span);
-        let fn_decl = cx.fn_decl(args, ast::FunctionRetTy::Ty(ret_type));
+        let fn_decl = cx.fn_decl(args, ast::FnRetTy::Ty(ret_type));
         let body_block = cx.block_expr(body);
 
         let unsafety = if self.is_unsafe { ast::Unsafe::Yes(trait_.span) } else { ast::Unsafe::No };

src/librustc_builtin_macros/global_allocator.rs

@@ -63,7 +63,7 @@ impl AllocFnFactory<'_, '_> {
         let args = method.inputs.iter().map(|ty| self.arg_ty(ty, &mut abi_args, mk)).collect();
         let result = self.call_allocator(method.name, args);
         let (output_ty, output_expr) = self.ret_ty(&method.output, result);
-        let decl = self.cx.fn_decl(abi_args, ast::FunctionRetTy::Ty(output_ty));
+        let decl = self.cx.fn_decl(abi_args, ast::FnRetTy::Ty(output_ty));
         let header = FnHeader { unsafety: Unsafe::Yes(self.span), ..FnHeader::default() };
         let sig = FnSig { decl, header };
         let kind = ItemKind::Fn(sig, Generics::default(), Some(self.cx.block_expr(output_expr)));

src/librustc_builtin_macros/test.rs

@@ -391,8 +391,8 @@ fn has_test_signature(cx: &ExtCtxt<'_>, i: &ast::Item) -> bool {
         // If the termination trait is active, the compiler will check that the output
         // type implements the `Termination` trait as `libtest` enforces that.
         let has_output = match sig.decl.output {
-            ast::FunctionRetTy::Default(..) => false,
-            ast::FunctionRetTy::Ty(ref t) if t.kind.is_unit() => false,
+            ast::FnRetTy::Default(..) => false,
+            ast::FnRetTy::Ty(ref t) if t.kind.is_unit() => false,
             _ => true,
         };
 

src/librustc_builtin_macros/test_harness.rs

@@ -305,7 +305,7 @@ fn mk_main(cx: &mut TestCtxt<'_>) -> P<ast::Item> {
         ecx.block(sp, vec![call_test_main])
     };
 
-    let decl = ecx.fn_decl(vec![], ast::FunctionRetTy::Ty(main_ret_ty));
+    let decl = ecx.fn_decl(vec![], ast::FnRetTy::Ty(main_ret_ty));
     let sig = ast::FnSig { decl, header: ast::FnHeader::default() };
     let main = ast::ItemKind::Fn(sig, ast::Generics::default(), Some(main_body));
 

src/librustc_expand/build.rs

@@ -519,7 +519,7 @@ impl<'a> ExtCtxt<'a> {
     pub fn lambda(&self, span: Span, ids: Vec<ast::Ident>, body: P<ast::Expr>) -> P<ast::Expr> {
         let fn_decl = self.fn_decl(
             ids.iter().map(|id| self.param(span, *id, self.ty(span, ast::TyKind::Infer))).collect(),
-            ast::FunctionRetTy::Default(span),
+            ast::FnRetTy::Default(span),
         );
 
         // FIXME -- We are using `span` as the span of the `|...|`
@@ -569,7 +569,7 @@ impl<'a> ExtCtxt<'a> {
     }
 
     // FIXME: unused `self`
-    pub fn fn_decl(&self, inputs: Vec<ast::Param>, output: ast::FunctionRetTy) -> P<ast::FnDecl> {
+    pub fn fn_decl(&self, inputs: Vec<ast::Param>, output: ast::FnRetTy) -> P<ast::FnDecl> {
         P(ast::FnDecl { inputs, output })
     }
 

src/librustc_hir/hir.rs

@@ -5,7 +5,7 @@ use crate::itemlikevisit;
 use crate::print;
 
 crate use BlockCheckMode::*;
-crate use FunctionRetTy::*;
+crate use FnRetTy::*;
 crate use UnsafeSource::*;
 
 use rustc_data_structures::fx::FxHashSet;
@@ -2079,7 +2079,7 @@ pub struct FnDecl<'hir> {
     ///
     /// Additional argument data is stored in the function's [body](Body::parameters).
     pub inputs: &'hir [Ty<'hir>],
-    pub output: FunctionRetTy<'hir>,
+    pub output: FnRetTy<'hir>,
     pub c_variadic: bool,
     /// Does the function have an implicit self?
     pub implicit_self: ImplicitSelfKind,
@@ -2145,7 +2145,7 @@ impl Defaultness {
 }
 
 #[derive(RustcEncodable, RustcDecodable, Debug, HashStable_Generic)]
-pub enum FunctionRetTy<'hir> {
+pub enum FnRetTy<'hir> {
     /// Return type is not specified.
     ///
     /// Functions default to `()` and
@@ -2156,7 +2156,7 @@ pub enum FunctionRetTy<'hir> {
     Return(&'hir Ty<'hir>),
 }
 
-impl fmt::Display for FunctionRetTy<'_> {
+impl fmt::Display for FnRetTy<'_> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
             Self::Return(ref ty) => print::to_string(print::NO_ANN, |s| s.print_type(ty)).fmt(f),
@@ -2165,7 +2165,7 @@ impl fmt::Display for FunctionRetTy<'_> {
     }
 }
 
-impl FunctionRetTy<'_> {
+impl FnRetTy<'_> {
     pub fn span(&self) -> Span {
         match *self {
             Self::DefaultReturn(span) => span,

src/librustc_hir/intravisit.rs

@@ -865,8 +865,8 @@ pub fn walk_where_predicate<'v, V: Visitor<'v>>(
     }
 }
 
-pub fn walk_fn_ret_ty<'v, V: Visitor<'v>>(visitor: &mut V, ret_ty: &'v FunctionRetTy<'v>) {
-    if let FunctionRetTy::Return(ref output_ty) = *ret_ty {
+pub fn walk_fn_ret_ty<'v, V: Visitor<'v>>(visitor: &mut V, ret_ty: &'v FnRetTy<'v>) {
+    if let FnRetTy::Return(ref output_ty) = *ret_ty {
         visitor.visit_ty(output_ty)
     }
 }

src/librustc_interface/util.rs

@@ -620,8 +620,8 @@ impl<'a, 'b> ReplaceBodyWithLoop<'a, 'b> {
         ret
     }
 
-    fn should_ignore_fn(ret_ty: &ast::FunctionRetTy) -> bool {
-        if let ast::FunctionRetTy::Ty(ref ty) = ret_ty {
+    fn should_ignore_fn(ret_ty: &ast::FnRetTy) -> bool {
+        if let ast::FnRetTy::Ty(ref ty) = ret_ty {
             fn involves_impl_trait(ty: &ast::Ty) -> bool {
                 match ty.kind {
                     ast::TyKind::ImplTrait(..) => true,

src/librustc_lint/types.rs

@@ -953,7 +953,7 @@ impl<'a, 'tcx> ImproperCTypesVisitor<'a, 'tcx> {
             self.check_type_for_ffi_and_report_errors(input_hir.span, input_ty, false);
         }
 
-        if let hir::FunctionRetTy::Return(ref ret_hir) = decl.output {
+        if let hir::FnRetTy::Return(ref ret_hir) = decl.output {
             let ret_ty = sig.output();
             if !ret_ty.is_unit() {
                 self.check_type_for_ffi_and_report_errors(ret_hir.span, ret_ty, false);

src/librustc_mir/borrow_check/diagnostics/conflict_errors.rs

@@ -1885,7 +1885,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                 // as the HIR doesn't have full types for closure arguments.
                 let return_ty = *sig.output().skip_binder();
                 let mut return_span = fn_decl.output.span();
-                if let hir::FunctionRetTy::Return(ty) = &fn_decl.output {
+                if let hir::FnRetTy::Return(ty) = &fn_decl.output {
                     if let hir::TyKind::Rptr(lifetime, _) = ty.kind {
                         return_span = lifetime.span;
                     }

src/librustc_mir/borrow_check/diagnostics/region_name.rs

@@ -645,8 +645,8 @@ impl<'tcx> MirBorrowckCtxt<'_, 'tcx> {
                 ..
             }) => (
                 match return_ty.output {
-                    hir::FunctionRetTy::DefaultReturn(_) => tcx.sess.source_map().end_point(*span),
-                    hir::FunctionRetTy::Return(_) => return_ty.output.span(),
+                    hir::FnRetTy::DefaultReturn(_) => tcx.sess.source_map().end_point(*span),
+                    hir::FnRetTy::Return(_) => return_ty.output.span(),
                 },
                 if gen_move.is_some() { " of generator" } else { " of closure" },
             ),

src/librustc_parse/parser/expr.rs

@@ -10,9 +10,7 @@ use rustc_span::source_map::{self, Span, Spanned};
 use rustc_span::symbol::{kw, sym, Symbol};
 use std::mem;
 use syntax::ast::{self, AttrStyle, AttrVec, CaptureBy, Field, Ident, Lit, DUMMY_NODE_ID};
-use syntax::ast::{
-    AnonConst, BinOp, BinOpKind, FnDecl, FunctionRetTy, Mac, Param, Ty, TyKind, UnOp,
-};
+use syntax::ast::{AnonConst, BinOp, BinOpKind, FnDecl, FnRetTy, Mac, Param, Ty, TyKind, UnOp};
 use syntax::ast::{Arm, Async, BlockCheckMode, Expr, ExprKind, Label, Movability, RangeLimits};
 use syntax::ptr::P;
 use syntax::token::{self, Token, TokenKind};
@@ -1358,7 +1356,7 @@ impl<'a> Parser<'a> {
         let decl = self.parse_fn_block_decl()?;
         let decl_hi = self.prev_span;
         let body = match decl.output {
-            FunctionRetTy::Default(_) => {
+            FnRetTy::Default(_) => {
                 let restrictions = self.restrictions - Restrictions::STMT_EXPR;
                 self.parse_expr_res(restrictions, None)?
             }