Improve hir pretty-printing of attributes.

compiler/rustc_hir_pretty/src/lib.rs

@@ -110,6 +110,7 @@ impl<'a> State<'a> {
                 }
                 self.print_attr_item(&unparsed, unparsed.span);
                 self.word("]");
+                self.hardbreak()
             }
             hir::Attribute::Parsed(AttributeKind::DocComment { style, kind, comment, .. }) => {
                 self.word(rustc_ast_pretty::pprust::state::doc_comment_to_string(

tests/pretty/hir-delegation.pp

@@ -2,7 +2,8 @@
 //@ pretty-mode:hir
 //@ pp-exact:hir-delegation.pp
 
-#![allow(incomplete_features)]#![feature(fn_delegation)]
+#![allow(incomplete_features)]
+#![feature(fn_delegation)]
 #[prelude_import]
 use ::std::prelude::rust_2015::*;
 #[macro_use]

tests/rustdoc-json/attrs/automatically_derived.rs

@@ -9,5 +9,5 @@ impl Default for Manual {
     }
 }
 
-//@ is '$.index[?(@.inner.impl.for.resolved_path.path == "Derive" && @.inner.impl.trait.path == "Default")].attrs' '["#[automatically_derived]"]'
+//@ is '$.index[?(@.inner.impl.for.resolved_path.path == "Derive" && @.inner.impl.trait.path == "Default")].attrs' '["#[automatically_derived]\n"]'
 //@ is '$.index[?(@.inner.impl.for.resolved_path.path == "Manual" && @.inner.impl.trait.path == "Default")].attrs' '[]'

tests/rustdoc-json/attrs/export_name_2021.rs

@@ -1,6 +1,6 @@
 //@ edition: 2021
 #![no_std]
 
-//@ is "$.index[?(@.name=='example')].attrs" '["#[export_name = \"altered\"]"]'
+//@ is "$.index[?(@.name=='example')].attrs" '["#[export_name = \"altered\"]\n"]'
 #[export_name = "altered"]
 pub extern "C" fn example() {}

tests/rustdoc-json/attrs/export_name_2024.rs

@@ -4,6 +4,6 @@
 // The representation of `#[unsafe(export_name = ..)]` in rustdoc in edition 2024
 // is still `#[export_name = ..]` without the `unsafe` attribute wrapper.
 
-//@ is "$.index[?(@.name=='example')].attrs" '["#[export_name = \"altered\"]"]'
+//@ is "$.index[?(@.name=='example')].attrs" '["#[export_name = \"altered\"]\n"]'
 #[unsafe(export_name = "altered")]
 pub extern "C" fn example() {}

tests/rustdoc-json/attrs/must_use.rs

@@ -1,9 +1,9 @@
 #![no_std]
 
-//@ is "$.index[?(@.name=='example')].attrs" '["#[must_use]"]'
+//@ is "$.index[?(@.name=='example')].attrs" '["#[must_use]\n"]'
 #[must_use]
 pub fn example() -> impl Iterator<Item = i64> {}
 
-//@ is "$.index[?(@.name=='explicit_message')].attrs" '["#[must_use = \"does nothing if you do not use it\"]"]'
+//@ is "$.index[?(@.name=='explicit_message')].attrs" '["#[must_use = \"does nothing if you do not use it\"]\n"]'
 #[must_use = "does nothing if you do not use it"]
 pub fn explicit_message() -> impl Iterator<Item = i64> {}

tests/rustdoc-json/attrs/no_mangle_2021.rs

@@ -1,6 +1,6 @@
 //@ edition: 2021
 #![no_std]
 
-//@ is "$.index[?(@.name=='example')].attrs" '["#[no_mangle]"]'
+//@ is "$.index[?(@.name=='example')].attrs" '["#[no_mangle]\n"]'
 #[no_mangle]
 pub extern "C" fn example() {}

tests/rustdoc-json/attrs/no_mangle_2024.rs

@@ -4,6 +4,6 @@
 // The representation of `#[unsafe(no_mangle)]` in rustdoc in edition 2024
 // is still `#[no_mangle]` without the `unsafe` attribute wrapper.
 
-//@ is "$.index[?(@.name=='example')].attrs" '["#[no_mangle]"]'
+//@ is "$.index[?(@.name=='example')].attrs" '["#[no_mangle]\n"]'
 #[unsafe(no_mangle)]
 pub extern "C" fn example() {}

tests/rustdoc-json/attrs/non_exhaustive.rs

@@ -1,18 +1,18 @@
 #![no_std]
 
-//@ is "$.index[?(@.name=='MyEnum')].attrs" '["#[non_exhaustive]"]'
+//@ is "$.index[?(@.name=='MyEnum')].attrs" '["#[non_exhaustive]\n"]'
 #[non_exhaustive]
 pub enum MyEnum {
     First,
 }
 
 pub enum NonExhaustiveVariant {
-    //@ is "$.index[?(@.name=='Variant')].attrs" '["#[non_exhaustive]"]'
+    //@ is "$.index[?(@.name=='Variant')].attrs" '["#[non_exhaustive]\n"]'
     #[non_exhaustive]
     Variant(i64),
 }
 
-//@ is "$.index[?(@.name=='MyStruct')].attrs" '["#[non_exhaustive]"]'
+//@ is "$.index[?(@.name=='MyStruct')].attrs" '["#[non_exhaustive]\n"]'
 #[non_exhaustive]
 pub struct MyStruct {
     pub x: i64,

tests/rustdoc-json/keyword_private.rs

@@ -5,7 +5,7 @@
 
 //@ !has "$.index[?(@.name=='match')]"
 //@ has  "$.index[?(@.name=='foo')]"
-//@ is   "$.index[?(@.name=='foo')].attrs" '["#[doc(keyword = \"match\")]"]'
+//@ is   "$.index[?(@.name=='foo')].attrs" '["#[doc(keyword = \"match\")]\n"]'
 //@ is   "$.index[?(@.name=='foo')].docs" '"this is a test!"'
 #[doc(keyword = "match")]
 /// this is a test!
@@ -13,7 +13,7 @@ pub mod foo {}
 
 //@ !has "$.index[?(@.name=='break')]"
 //@ has "$.index[?(@.name=='bar')]"
-//@ is   "$.index[?(@.name=='bar')].attrs" '["#[doc(keyword = \"break\")]"]'
+//@ is   "$.index[?(@.name=='bar')].attrs" '["#[doc(keyword = \"break\")]\n"]'
 //@ is   "$.index[?(@.name=='bar')].docs" '"hello"'
 #[doc(keyword = "break")]
 /// hello

tests/ui-fulldeps/stable-mir/check_attribute.rs

@@ -35,12 +35,12 @@ fn test_stable_mir() -> ControlFlow<()> {
 fn test_tool(items: &CrateItems) {
     let rustfmt_fn = *get_item(&items, "do_not_format").unwrap();
     let rustfmt_attrs = rustfmt_fn.tool_attrs(&["rustfmt".to_string(), "skip".to_string()]);
-    assert_eq!(rustfmt_attrs[0].as_str(), "#[rustfmt::skip]");
+    assert_eq!(rustfmt_attrs[0].as_str(), "#[rustfmt::skip]\n");
 
     let clippy_fn = *get_item(&items, "complex_fn").unwrap();
     let clippy_attrs = clippy_fn.tool_attrs(&["clippy".to_string(),
                                                "cyclomatic_complexity".to_string()]);
-    assert_eq!(clippy_attrs[0].as_str(), "#[clippy::cyclomatic_complexity = \"100\"]");
+    assert_eq!(clippy_attrs[0].as_str(), "#[clippy::cyclomatic_complexity = \"100\"]\n");
 }
 
 fn get_item<'a>(

tests/ui/unpretty/exhaustive.hir.stdout

@@ -8,7 +8,28 @@
 // Note: the HIR revision includes a `.stderr` file because there are some
 // errors that only occur once we get past the AST.
 
-#![feature(auto_traits)]#![feature(box_patterns)]#![feature(builtin_syntax)]#![feature(concat_idents)]#![feature(const_trait_impl)]#![feature(decl_macro)]#![feature(deref_patterns)]#![feature(dyn_star)]#![feature(explicit_tail_calls)]#![feature(gen_blocks)]#![feature(more_qualified_paths)]#![feature(never_patterns)]#![feature(never_type)]#![feature(pattern_types)]#![feature(pattern_type_macro)]#![feature(prelude_import)]#![feature(specialization)]#![feature(trace_macros)]#![feature(trait_alias)]#![feature(try_blocks)]#![feature(yeet_expr)]#![allow(incomplete_features)]
+#![feature(auto_traits)]
+#![feature(box_patterns)]
+#![feature(builtin_syntax)]
+#![feature(concat_idents)]
+#![feature(const_trait_impl)]
+#![feature(decl_macro)]
+#![feature(deref_patterns)]
+#![feature(dyn_star)]
+#![feature(explicit_tail_calls)]
+#![feature(gen_blocks)]
+#![feature(more_qualified_paths)]
+#![feature(never_patterns)]
+#![feature(never_type)]
+#![feature(pattern_types)]
+#![feature(pattern_type_macro)]
+#![feature(prelude_import)]
+#![feature(specialization)]
+#![feature(trace_macros)]
+#![feature(trait_alias)]
+#![feature(try_blocks)]
+#![feature(yeet_expr)]
+#![allow(incomplete_features)]
 #[prelude_import]
 use std::prelude::rust_2024::*;
 #[macro_use]
@@ -33,20 +54,25 @@ mod prelude {
 /*!
      * inner multi-line doc comment
      */
-#[doc = "inner doc attribute"]#[allow(dead_code, unused_variables)]#[no_std]
+#[doc = "inner doc attribute"]
+#[allow(dead_code, unused_variables)]
+#[no_std]
 mod attributes {//! inner single-line doc comment
     /*!
      * inner multi-line doc comment
      */
-    #![doc =
-    "inner doc attribute"]#![allow(dead_code, unused_variables)]#![no_std]
+    #![doc = "inner doc attribute"]
+    #![allow(dead_code, unused_variables)]
+    #![no_std]
 
     /// outer single-line doc comment
     /**
      * outer multi-line doc comment
      */
-    #[doc =
-    "outer doc attribute"]#[doc = "macro"]#[allow()]#[attr = Repr([ReprC])]
+    #[doc = "outer doc attribute"]
+    #[doc = "macro"]
+    #[allow()]
+    #[attr = Repr([ReprC])]
     struct Struct;
 }