Merging upstream version 1.69.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

4 files changed, 128 insertions, 11 deletions

diff --git a/compiler/rustc_ast_pretty/Cargo.toml b/compiler/rustc_ast_pretty/Cargo.toml
index a3e3e823b..980a8fa93 100644
--- a/compiler/rustc_ast_pretty/Cargo.toml
+++ b/compiler/rustc_ast_pretty/Cargo.toml
@@ -6,5 +6,6 @@ edition = "2021"
 [lib]
 
 [dependencies]
-rustc_span = { path = "../rustc_span" }
 rustc_ast = { path = "../rustc_ast" }
+rustc_span = { path = "../rustc_span" }
+thin-vec = "0.2.12"
diff --git a/compiler/rustc_ast_pretty/src/pprust/state.rs b/compiler/rustc_ast_pretty/src/pprust/state.rs
index 6a8064b0e..694d688bf 100644
--- a/compiler/rustc_ast_pretty/src/pprust/state.rs
+++ b/compiler/rustc_ast_pretty/src/pprust/state.rs
@@ -4,7 +4,7 @@ mod item;
 
 use crate::pp::Breaks::{Consistent, Inconsistent};
 use crate::pp::{self, Breaks};
-
+use rustc_ast::attr::AttrIdGenerator;
 use rustc_ast::ptr::P;
 use rustc_ast::token::{self, BinOpToken, CommentKind, Delimiter, Nonterminal, Token, TokenKind};
 use rustc_ast::tokenstream::{TokenStream, TokenTree};
@@ -20,9 +20,8 @@ use rustc_span::edition::Edition;
 use rustc_span::source_map::{SourceMap, Spanned};
 use rustc_span::symbol::{kw, sym, Ident, IdentPrinter, Symbol};
 use rustc_span::{BytePos, FileName, Span, DUMMY_SP};
-
-use rustc_ast::attr::AttrIdGenerator;
 use std::borrow::Cow;
+use thin_vec::ThinVec;
 
 pub use self::delimited::IterDelimited;
 
@@ -131,7 +130,7 @@ pub fn print_crate<'a>(
 
         // Currently, in Rust 2018 we don't have `extern crate std;` at the crate
         // root, so this is not needed, and actually breaks things.
-        if edition == Edition::Edition2015 {
+        if edition.is_rust_2015() {
             // `#![no_std]`
             let fake_attr = attr::mk_attr_word(g, ast::AttrStyle::Inner, sym::no_std, DUMMY_SP);
             s.print_attribute(&fake_attr);
@@ -1567,8 +1566,18 @@ impl<'a> State<'a> {
 
             match bound {
                 GenericBound::Trait(tref, modifier) => {
-                    if modifier == &TraitBoundModifier::Maybe {
-                        self.word("?");
+                    match modifier {
+                        TraitBoundModifier::None => {}
+                        TraitBoundModifier::Maybe => {
+                            self.word("?");
+                        }
+                        TraitBoundModifier::MaybeConst => {
+                            self.word_space("~const");
+                        }
+                        TraitBoundModifier::MaybeConstMaybe => {
+                            self.word_space("~const");
+                            self.word("?");
+                        }
                     }
                     self.print_poly_trait_ref(tref);
                 }
@@ -1712,10 +1721,10 @@ impl<'a> State<'a> {
         self.ibox(INDENT_UNIT);
         self.print_formal_generic_params(generic_params);
         let generics = ast::Generics {
-            params: Vec::new(),
+            params: ThinVec::new(),
             where_clause: ast::WhereClause {
                 has_where_token: false,
-                predicates: Vec::new(),
+                predicates: ThinVec::new(),
                 span: DUMMY_SP,
             },
             span: DUMMY_SP,
diff --git a/compiler/rustc_ast_pretty/src/pprust/state/expr.rs b/compiler/rustc_ast_pretty/src/pprust/state/expr.rs
index 2a18e5164..cacfe9eb2 100644
--- a/compiler/rustc_ast_pretty/src/pprust/state/expr.rs
+++ b/compiler/rustc_ast_pretty/src/pprust/state/expr.rs
@@ -6,6 +6,11 @@ use rustc_ast::token;
 use rustc_ast::util::literal::escape_byte_str_symbol;
 use rustc_ast::util::parser::{self, AssocOp, Fixity};
 use rustc_ast::{self as ast, BlockCheckMode};
+use rustc_ast::{
+    FormatAlignment, FormatArgPosition, FormatArgsPiece, FormatCount, FormatDebugHex, FormatSign,
+    FormatTrait,
+};
+use std::fmt::Write;
 
 impl<'a> State<'a> {
     fn print_else(&mut self, els: Option<&ast::Expr>) {
@@ -527,9 +532,23 @@ impl<'a> State<'a> {
                 }
             }
             ast::ExprKind::InlineAsm(a) => {
+                // FIXME: This should have its own syntax, distinct from a macro invocation.
                 self.word("asm!");
                 self.print_inline_asm(a);
             }
+            ast::ExprKind::FormatArgs(fmt) => {
+                // FIXME: This should have its own syntax, distinct from a macro invocation.
+                self.word("format_args!");
+                self.popen();
+                self.rbox(0, Inconsistent);
+                self.word(reconstruct_format_args_template_string(&fmt.template));
+                for arg in fmt.arguments.all_args() {
+                    self.word_space(",");
+                    self.print_expr(&arg.expr);
+                }
+                self.end();
+                self.pclose();
+            }
             ast::ExprKind::MacCall(m) => self.print_mac(m),
             ast::ExprKind::Paren(e) => {
                 self.popen();
@@ -629,3 +648,88 @@ impl<'a> State<'a> {
         }
     }
 }
+
+pub fn reconstruct_format_args_template_string(pieces: &[FormatArgsPiece]) -> String {
+    let mut template = "\"".to_string();
+    for piece in pieces {
+        match piece {
+            FormatArgsPiece::Literal(s) => {
+                for c in s.as_str().escape_debug() {
+                    template.push(c);
+                    if let '{' | '}' = c {
+                        template.push(c);
+                    }
+                }
+            }
+            FormatArgsPiece::Placeholder(p) => {
+                template.push('{');
+                let (Ok(n) | Err(n)) = p.argument.index;
+                write!(template, "{n}").unwrap();
+                if p.format_options != Default::default() || p.format_trait != FormatTrait::Display
+                {
+                    template.push_str(":");
+                }
+                if let Some(fill) = p.format_options.fill {
+                    template.push(fill);
+                }
+                match p.format_options.alignment {
+                    Some(FormatAlignment::Left) => template.push_str("<"),
+                    Some(FormatAlignment::Right) => template.push_str(">"),
+                    Some(FormatAlignment::Center) => template.push_str("^"),
+                    None => {}
+                }
+                match p.format_options.sign {
+                    Some(FormatSign::Plus) => template.push('+'),
+                    Some(FormatSign::Minus) => template.push('-'),
+                    None => {}
+                }
+                if p.format_options.alternate {
+                    template.push('#');
+                }
+                if p.format_options.zero_pad {
+                    template.push('0');
+                }
+                if let Some(width) = &p.format_options.width {
+                    match width {
+                        FormatCount::Literal(n) => write!(template, "{n}").unwrap(),
+                        FormatCount::Argument(FormatArgPosition {
+                            index: Ok(n) | Err(n), ..
+                        }) => {
+                            write!(template, "{n}$").unwrap();
+                        }
+                    }
+                }
+                if let Some(precision) = &p.format_options.precision {
+                    template.push('.');
+                    match precision {
+                        FormatCount::Literal(n) => write!(template, "{n}").unwrap(),
+                        FormatCount::Argument(FormatArgPosition {
+                            index: Ok(n) | Err(n), ..
+                        }) => {
+                            write!(template, "{n}$").unwrap();
+                        }
+                    }
+                }
+                match p.format_options.debug_hex {
+                    Some(FormatDebugHex::Lower) => template.push('x'),
+                    Some(FormatDebugHex::Upper) => template.push('X'),
+                    None => {}
+                }
+                template.push_str(match p.format_trait {
+                    FormatTrait::Display => "",
+                    FormatTrait::Debug => "?",
+                    FormatTrait::LowerExp => "e",
+                    FormatTrait::UpperExp => "E",
+                    FormatTrait::Octal => "o",
+                    FormatTrait::Pointer => "p",
+                    FormatTrait::Binary => "b",
+                    FormatTrait::LowerHex => "x",
+                    FormatTrait::UpperHex => "X",
+                });
+                template.push('}');
+            }
+        }
+    }
+    template.push('"');
+    template
+}
diff --git a/compiler/rustc_ast_pretty/src/pprust/tests.rs b/compiler/rustc_ast_pretty/src/pprust/tests.rs
index 6c8d42f33..3b2b60a86 100644
--- a/compiler/rustc_ast_pretty/src/pprust/tests.rs
+++ b/compiler/rustc_ast_pretty/src/pprust/tests.rs
@@ -3,6 +3,7 @@ use super::*;
 use rustc_ast as ast;
 use rustc_span::create_default_session_globals_then;
 use rustc_span::symbol::Ident;
+use thin_vec::ThinVec;
 
 fn fun_to_string(
     decl: &ast::FnDecl,
@@ -27,8 +28,10 @@ fn test_fun_to_string() {
     create_default_session_globals_then(|| {
         let abba_ident = Ident::from_str("abba");
 
-        let decl =
-            ast::FnDecl { inputs: Vec::new(), output: ast::FnRetTy::Default(rustc_span::DUMMY_SP) };
+        let decl = ast::FnDecl {
+            inputs: ThinVec::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),