Merge pull request #5487 from calebcartwright/subtree-sync-2022-08-06

Sync subtree

rust-toolchain

@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2022-06-21"
+channel = "nightly-2022-08-06"
 components = ["rustc-dev"]

src/closures.rs

@@ -11,6 +11,7 @@ use crate::overflow::OverflowableItem;
 use crate::rewrite::{Rewrite, RewriteContext};
 use crate::shape::Shape;
 use crate::source_map::SpanUtils;
+use crate::types::rewrite_lifetime_param;
 use crate::utils::{last_line_width, left_most_sub_expr, stmt_expr, NodeIdExt};
 
 // This module is pretty messy because of the rules around closures and blocks:
@@ -24,6 +25,7 @@ use crate::utils::{last_line_width, left_most_sub_expr, stmt_expr, NodeIdExt};
 //     can change whether it is treated as an expression or statement.
 
 pub(crate) fn rewrite_closure(
+    binder: &ast::ClosureBinder,
     capture: ast::CaptureBy,
     is_async: &ast::Async,
     movability: ast::Movability,
@@ -36,7 +38,7 @@ pub(crate) fn rewrite_closure(
     debug!("rewrite_closure {:?}", body);
 
     let (prefix, extra_offset) = rewrite_closure_fn_decl(
-        capture, is_async, movability, fn_decl, body, span, context, shape,
+        binder, capture, is_async, movability, fn_decl, body, span, context, shape,
     )?;
     // 1 = space between `|...|` and body.
     let body_shape = shape.offset_left(extra_offset)?;
@@ -227,6 +229,7 @@ fn rewrite_closure_block(
 
 // Return type is (prefix, extra_offset)
 fn rewrite_closure_fn_decl(
+    binder: &ast::ClosureBinder,
     capture: ast::CaptureBy,
     asyncness: &ast::Async,
     movability: ast::Movability,
@@ -236,6 +239,17 @@ fn rewrite_closure_fn_decl(
     context: &RewriteContext<'_>,
     shape: Shape,
 ) -> Option<(String, usize)> {
+    let binder = match binder {
+        ast::ClosureBinder::For { generic_params, .. } if generic_params.is_empty() => {
+            "for<> ".to_owned()
+        }
+        ast::ClosureBinder::For { generic_params, .. } => {
+            let lifetime_str = rewrite_lifetime_param(context, shape, generic_params)?;
+            format!("for<{lifetime_str}> ")
+        }
+        ast::ClosureBinder::NotPresent => "".to_owned(),
+    };
+
     let immovable = if movability == ast::Movability::Static {
         "static "
     } else {
@@ -250,7 +264,7 @@ fn rewrite_closure_fn_decl(
     // 4 = "|| {".len(), which is overconservative when the closure consists of
     // a single expression.
     let nested_shape = shape
-        .shrink_left(immovable.len() + is_async.len() + mover.len())?
+        .shrink_left(binder.len() + immovable.len() + is_async.len() + mover.len())?
         .sub_width(4)?;
 
     // 1 = |
@@ -288,7 +302,7 @@ fn rewrite_closure_fn_decl(
         .tactic(tactic)
         .preserve_newline(true);
     let list_str = write_list(&item_vec, &fmt)?;
-    let mut prefix = format!("{}{}{}|{}|", immovable, is_async, mover, list_str);
+    let mut prefix = format!("{}{}{}{}|{}|", binder, immovable, is_async, mover, list_str);
 
     if !ret_str.is_empty() {
         if prefix.contains('\n') {
@@ -312,8 +326,15 @@ pub(crate) fn rewrite_last_closure(
     expr: &ast::Expr,
     shape: Shape,
 ) -> Option<String> {
-    if let ast::ExprKind::Closure(capture, ref is_async, movability, ref fn_decl, ref body, _) =
-        expr.kind
+    if let ast::ExprKind::Closure(
+        ref binder,
+        capture,
+        ref is_async,
+        movability,
+        ref fn_decl,
+        ref body,
+        _,
+    ) = expr.kind
     {
         let body = match body.kind {
             ast::ExprKind::Block(ref block, _)
@@ -326,7 +347,7 @@ pub(crate) fn rewrite_last_closure(
             _ => body,
         };
         let (prefix, extra_offset) = rewrite_closure_fn_decl(
-            capture, is_async, movability, fn_decl, body, expr.span, context, shape,
+            binder, capture, is_async, movability, fn_decl, body, expr.span, context, shape,
         )?;
         // If the closure goes multi line before its body, do not overflow the closure.
         if prefix.contains('\n') {

src/config/mod.rs

@@ -20,9 +20,11 @@ pub use crate::config::options::*;
 #[macro_use]
 pub(crate) mod config_type;
 #[macro_use]
+#[allow(unreachable_pub)]
 pub(crate) mod options;
 
 pub(crate) mod file_lines;
+#[allow(unreachable_pub)]
 pub(crate) mod lists;
 pub(crate) mod macro_names;
 
@@ -420,7 +422,7 @@ mod test {
         use rustfmt_config_proc_macro::config_type;
 
         #[config_type]
-        pub enum PartiallyUnstableOption {
+        pub(crate) enum PartiallyUnstableOption {
             V1,
             V2,
             #[unstable_variant]

src/expr.rs

@@ -203,11 +203,17 @@ pub(crate) fn format_expr(
                 Some("yield".to_string())
             }
         }
-        ast::ExprKind::Closure(capture, ref is_async, movability, ref fn_decl, ref body, _) => {
-            closures::rewrite_closure(
-                capture, is_async, movability, fn_decl, body, expr.span, context, shape,
-            )
-        }
+        ast::ExprKind::Closure(
+            ref binder,
+            capture,
+            ref is_async,
+            movability,
+            ref fn_decl,
+            ref body,
+            _,
+        ) => closures::rewrite_closure(
+            binder, capture, is_async, movability, fn_decl, body, expr.span, context, shape,
+        ),
         ast::ExprKind::Try(..)
         | ast::ExprKind::Field(..)
         | ast::ExprKind::MethodCall(..)

src/items.rs

@@ -148,7 +148,7 @@ impl<'a> Item<'a> {
         Item {
             unsafety: fm.unsafety,
             abi: format_extern(
-                ast::Extern::from_abi(fm.abi),
+                ast::Extern::from_abi(fm.abi, DUMMY_SP),
                 config.force_explicit_abi(),
                 true,
             ),

src/macros.rs

@@ -13,7 +13,7 @@ use std::collections::HashMap;
 use std::panic::{catch_unwind, AssertUnwindSafe};
 
 use rustc_ast::token::{BinOpToken, Delimiter, Token, TokenKind};
-use rustc_ast::tokenstream::{Cursor, Spacing, TokenStream, TokenTree};
+use rustc_ast::tokenstream::{Cursor, TokenStream, TokenTree};
 use rustc_ast::{ast, ptr};
 use rustc_ast_pretty::pprust;
 use rustc_span::{
@@ -683,7 +683,7 @@ struct MacroArgParser {
 
 fn last_tok(tt: &TokenTree) -> Token {
     match *tt {
-        TokenTree::Token(ref t) => t.clone(),
+        TokenTree::Token(ref t, _) => t.clone(),
         TokenTree::Delimited(delim_span, delim, _) => Token {
             kind: TokenKind::CloseDelim(delim),
             span: delim_span.close,
@@ -738,10 +738,13 @@ impl MacroArgParser {
 
     fn add_meta_variable(&mut self, iter: &mut Cursor) -> Option<()> {
         match iter.next() {
-            Some(TokenTree::Token(Token {
-                kind: TokenKind::Ident(name, _),
-                ..
-            })) => {
+            Some(TokenTree::Token(
+                Token {
+                    kind: TokenKind::Ident(name, _),
+                    ..
+                },
+                _,
+            )) => {
                 self.result.push(ParsedMacroArg {
                     kind: MacroArgKind::MetaVariable(name, self.buf.clone()),
                 });
@@ -778,21 +781,30 @@ impl MacroArgParser {
             }
 
             match tok {
-                TokenTree::Token(Token {
-                    kind: TokenKind::BinOp(BinOpToken::Plus),
-                    ..
-                })
-                | TokenTree::Token(Token {
-                    kind: TokenKind::Question,
-                    ..
-                })
-                | TokenTree::Token(Token {
-                    kind: TokenKind::BinOp(BinOpToken::Star),
-                    ..
-                }) => {
+                TokenTree::Token(
+                    Token {
+                        kind: TokenKind::BinOp(BinOpToken::Plus),
+                        ..
+                    },
+                    _,
+                )
+                | TokenTree::Token(
+                    Token {
+                        kind: TokenKind::Question,
+                        ..
+                    },
+                    _,
+                )
+                | TokenTree::Token(
+                    Token {
+                        kind: TokenKind::BinOp(BinOpToken::Star),
+                        ..
+                    },
+                    _,
+                ) => {
                     break;
                 }
-                TokenTree::Token(ref t) => {
+                TokenTree::Token(ref t, _) => {
                     buffer.push_str(&pprust::token_to_string(t));
                 }
                 _ => return None,
@@ -860,10 +872,13 @@ impl MacroArgParser {
 
         while let Some(tok) = iter.next() {
             match tok {
-                TokenTree::Token(Token {
-                    kind: TokenKind::Dollar,
-                    span,
-                }) => {
+                TokenTree::Token(
+                    Token {
+                        kind: TokenKind::Dollar,
+                        span,
+                    },
+                    _,
+                ) => {
                     // We always want to add a separator before meta variables.
                     if !self.buf.is_empty() {
                         self.add_separator();
@@ -876,13 +891,16 @@ impl MacroArgParser {
                         span,
                     };
                 }
-                TokenTree::Token(Token {
-                    kind: TokenKind::Colon,
-                    ..
-                }) if self.is_meta_var => {
+                TokenTree::Token(
+                    Token {
+                        kind: TokenKind::Colon,
+                        ..
+                    },
+                    _,
+                ) if self.is_meta_var => {
                     self.add_meta_variable(&mut iter)?;
                 }
-                TokenTree::Token(ref t) => self.update_buffer(t),
+                TokenTree::Token(ref t, _) => self.update_buffer(t),
                 TokenTree::Delimited(_delimited_span, delimited, ref tts) => {
                     if !self.buf.is_empty() {
                         if next_space(&self.last_tok.kind) == SpaceState::Always {
@@ -1124,12 +1142,15 @@ impl MacroParser {
             TokenTree::Token(..) => return None,
             TokenTree::Delimited(delimited_span, d, _) => (delimited_span.open.lo(), d),
         };
-        let args = TokenStream::new(vec![(tok, Spacing::Joint)]);
+        let args = TokenStream::new(vec![tok]);
         match self.toks.next()? {
-            TokenTree::Token(Token {
-                kind: TokenKind::FatArrow,
-                ..
-            }) => {}
+            TokenTree::Token(
+                Token {
+                    kind: TokenKind::FatArrow,
+                    ..
+                },
+                _,
+            ) => {}
             _ => return None,
         }
         let (mut hi, body, whole_body) = match self.toks.next()? {
@@ -1148,10 +1169,13 @@ impl MacroParser {
                 )
             }
         };
-        if let Some(TokenTree::Token(Token {
-            kind: TokenKind::Semi,
-            span,
-        })) = self.toks.look_ahead(0)
+        if let Some(TokenTree::Token(
+            Token {
+                kind: TokenKind::Semi,
+                span,
+            },
+            _,
+        )) = self.toks.look_ahead(0)
         {
             hi = span.hi();
             self.toks.next();

src/types.rs

@@ -1067,7 +1067,7 @@ pub(crate) fn can_be_overflowed_type(
 }
 
 /// Returns `None` if there is no `LifetimeDef` in the given generic parameters.
-fn rewrite_lifetime_param(
+pub(crate) fn rewrite_lifetime_param(
     context: &RewriteContext<'_>,
     shape: Shape,
     generic_params: &[ast::GenericParam],

src/utils.rs

@@ -138,8 +138,8 @@ pub(crate) fn format_extern(
 ) -> Cow<'static, str> {
     let abi = match ext {
         ast::Extern::None => "Rust".to_owned(),
-        ast::Extern::Implicit => "C".to_owned(),
-        ast::Extern::Explicit(abi) => abi.symbol_unescaped.to_string(),
+        ast::Extern::Implicit(_) => "C".to_owned(),
+        ast::Extern::Explicit(abi, _) => abi.symbol_unescaped.to_string(),
     };
 
     if abi == "Rust" && !is_mod {
@@ -480,7 +480,7 @@ pub(crate) fn is_block_expr(context: &RewriteContext<'_>, expr: &ast::Expr, repr
         | ast::ExprKind::Binary(_, _, ref expr)
         | ast::ExprKind::Index(_, ref expr)
         | ast::ExprKind::Unary(_, ref expr)
-        | ast::ExprKind::Closure(_, _, _, _, ref expr, _)
+        | ast::ExprKind::Closure(_, _, _, _, _, ref expr, _)
         | ast::ExprKind::Try(ref expr)
         | ast::ExprKind::Yield(Some(ref expr)) => is_block_expr(context, expr, repr),
         // This can only be a string lit

tests/source/closure.rs

@@ -51,6 +51,16 @@ fn main() {
                 "--emit=dep-info"
             } else { a }
         });
+
+    for<>          || -> () {};
+    for<         >|| -> () {};
+    for<
+>   || -> () {};
+
+for<   'a
+   ,'b,
+'c  >   |_: &'a (), _: &'b (), _: &'c ()| -> () {};
+
 }
 
 fn issue311() {

tests/target/closure.rs

@@ -71,6 +71,12 @@ fn main() {
             a
         }
     });
+
+    for<> || -> () {};
+    for<> || -> () {};
+    for<> || -> () {};
+
+    for<'a, 'b, 'c> |_: &'a (), _: &'b (), _: &'c ()| -> () {};
 }
 
 fn issue311() {