Rollup merge of #136312 - compiler-errors:overflow_delimited_expr-2024, r=ytmimi

Disable `overflow_delimited_expr` in edition 2024

This reverts the style guide changes and sets the default to "false" in rustfmt for style edition 2024.

r? `@ytmimi`

cc `@rust-lang/style` `@rust-lang/rustfmt`

src/doc/style-guide/src/editions.md

@@ -36,10 +36,6 @@ For a full history of changes in the Rust 2024 style edition, see the git
 history of the style guide. Notable changes in the Rust 2024 style edition
 include:
 
-- [#114764](https://github.com/rust-lang/rust/pull/114764) As the last member
-  of a delimited expression, delimited expressions are generally combinable,
-  regardless of the number of members. Previously only applied with exactly
-  one member (except for closures with explicit blocks).
 - Miscellaneous `rustfmt` bugfixes.
 - Use version-sort (sort `x8`, `x16`, `x32`, `x64`, `x128` in that order).
 - Change "ASCIIbetical" sort to Unicode-aware "non-lowercase before lowercase".

src/doc/style-guide/src/expressions.md

@@ -818,11 +818,11 @@ E.g., `&&Some(foo)` matches, `Foo(4, Bar)` does not.
 
 ## Combinable expressions
 
-When the last argument in a function call is formatted across
-multiple-lines, format the outer call as if it were a single-line call,
+Where a function call has a single argument, and that argument is formatted
+across multiple-lines, format the outer call as if it were a single-line call,
 if the result fits. Apply the same combining behaviour to any similar
 expressions which have multi-line, block-indented lists of sub-expressions
-delimited by parentheses, brackets, or braces. E.g.,
+delimited by parentheses (e.g., macros or tuple struct literals). E.g.,
 
 ```rust
 foo(bar(
@@ -848,61 +848,20 @@ let arr = [combinable(
     an_expr,
     another_expr,
 )];
-
-let x = Thing(an_expr, another_expr, match cond {
-    A => 1,
-    B => 2,
-});
-
-let x = format!("Stuff: {}", [
-    an_expr,
-    another_expr,
-]);
-
-let x = func(an_expr, another_expr, SomeStruct {
-    field: this_is_long,
-    another_field: 123,
-});
 ```
 
 Apply this behavior recursively.
 
-If the last argument is a multi-line closure with an explicit block,
-only apply the combining behavior if there are no other closure arguments.
+For a function with multiple arguments, if the last argument is a multi-line
+closure with an explicit block, there are no other closure arguments, and all
+the arguments and the first line of the closure fit on the first line, use the
+same combining behavior:
 
 ```rust
-// Combinable
 foo(first_arg, x, |param| {
     action();
     foo(param)
 })
-// Not combinable, because the closure is not the last argument
-foo(
-    first_arg,
-    |param| {
-        action();
-        foo(param)
-    },
-    whatever,
-)
-// Not combinable, because the first line of the closure does not fit
-foo(
-    first_arg,
-    x,
-    move |very_long_param_causing_line_to_overflow| -> Bar {
-        action();
-        foo(param)
-    },
-)
-// Not combinable, because there is more than one closure argument
-foo(
-    first_arg,
-    |x| x.bar(),
-    |param| {
-        action();
-        foo(param)
-    },
-)
 ```
 
 ## Ranges

src/tools/rustfmt/src/bin/main.rs

@@ -817,7 +817,6 @@ mod test {
         options.inline_config = HashMap::from([("version".to_owned(), "Two".to_owned())]);
         let config = get_config(None, Some(options));
         assert_eq!(config.style_edition(), StyleEdition::Edition2024);
-        assert_eq!(config.overflow_delimited_expr(), true);
     }
 
     #[nightly_only_test]
@@ -827,7 +826,6 @@ mod test {
         let config_file = Some(Path::new("tests/config/style-edition/just-version"));
         let config = get_config(config_file, Some(options));
         assert_eq!(config.style_edition(), StyleEdition::Edition2024);
-        assert_eq!(config.overflow_delimited_expr(), true);
     }
 
     #[nightly_only_test]
@@ -872,7 +870,6 @@ mod test {
         ]);
         let config = get_config(None, Some(options));
         assert_eq!(config.style_edition(), StyleEdition::Edition2024);
-        assert_eq!(config.overflow_delimited_expr(), true);
     }
 
     #[nightly_only_test]
@@ -938,7 +935,6 @@ mod test {
         options.style_edition = Some(StyleEdition::Edition2024);
         let config = get_config(None, Some(options));
         assert_eq!(config.style_edition(), StyleEdition::Edition2024);
-        assert_eq!(config.overflow_delimited_expr(), true);
     }
 
     #[nightly_only_test]
@@ -948,6 +944,8 @@ mod test {
         let config_file = Some(Path::new("tests/config/style-edition/overrides"));
         let config = get_config(config_file, Some(options));
         assert_eq!(config.style_edition(), StyleEdition::Edition2024);
+        // FIXME: this test doesn't really exercise anything, since
+        // `overflow_delimited_expr` is disabled by default in edition 2024.
         assert_eq!(config.overflow_delimited_expr(), false);
     }
 
@@ -959,7 +957,8 @@ mod test {
         options.inline_config =
             HashMap::from([("overflow_delimited_expr".to_owned(), "false".to_owned())]);
         let config = get_config(config_file, Some(options));
-        assert_eq!(config.style_edition(), StyleEdition::Edition2024);
+        // FIXME: this test doesn't really exercise anything, since
+        // `overflow_delimited_expr` is disabled by default in edition 2024.
         assert_eq!(config.overflow_delimited_expr(), false);
     }
 }

src/tools/rustfmt/src/config/mod.rs

@@ -848,7 +848,7 @@ binop_separator = "Front"
 remove_nested_parens = true
 combine_control_expr = true
 short_array_element_width_threshold = 10
-overflow_delimited_expr = true
+overflow_delimited_expr = false
 struct_field_align_threshold = 0
 enum_discrim_align_threshold = 0
 match_arm_blocks = true

src/tools/rustfmt/src/config/options.rs

@@ -627,7 +627,7 @@ config_option_with_style_edition_default!(
     RemoveNestedParens, bool, _ => true;
     CombineControlExpr, bool, _ => true;
     ShortArrayElementWidthThreshold, usize, _ => 10;
-    OverflowDelimitedExpr, bool, Edition2024 => true, _ => false;
+    OverflowDelimitedExpr, bool, _ => false;
     StructFieldAlignThreshold, usize, _ => 0;
     EnumDiscrimAlignThreshold, usize, _ => 0;
     MatchArmBlocks, bool, _ => true;
@@ -644,7 +644,7 @@ config_option_with_style_edition_default!(
     BlankLinesLowerBound, usize, _ => 0;
     EditionConfig, Edition, _ => Edition::Edition2015;
     StyleEditionConfig, StyleEdition,
-        Edition2024 =>  StyleEdition::Edition2024, _ => StyleEdition::Edition2015;
+        Edition2024 => StyleEdition::Edition2024, _ => StyleEdition::Edition2015;
     VersionConfig, Version, Edition2024 => Version::Two, _ => Version::One;
     InlineAttributeWidth, usize, _ => 0;
     FormatGeneratedFiles, bool, _ => true;

src/tools/rustfmt/tests/target/configs/style_edition/overflow_delim_expr_2024.rs

@@ -25,10 +25,13 @@ fn combine_blocklike() {
         y: value2,
     });
 
-    do_thing(x, Bar {
-        x: value,
-        y: value2,
-    });
+    do_thing(
+        x,
+        Bar {
+            x: value,
+            y: value2,
+        },
+    );
 
     do_thing(
         x,
@@ -46,12 +49,15 @@ fn combine_blocklike() {
         value4_with_longer_name,
     ]);
 
-    do_thing(x, &[
-        value_with_longer_name,
-        value2_with_longer_name,
-        value3_with_longer_name,
-        value4_with_longer_name,
-    ]);
+    do_thing(
+        x,
+        &[
+            value_with_longer_name,
+            value2_with_longer_name,
+            value3_with_longer_name,
+            value4_with_longer_name,
+        ],
+    );
 
     do_thing(
         x,
@@ -71,12 +77,15 @@ fn combine_blocklike() {
         value4_with_longer_name,
     ]);
 
-    do_thing(x, vec![
-        value_with_longer_name,
-        value2_with_longer_name,
-        value3_with_longer_name,
-        value4_with_longer_name,
-    ]);
+    do_thing(
+        x,
+        vec![
+            value_with_longer_name,
+            value2_with_longer_name,
+            value3_with_longer_name,
+            value4_with_longer_name,
+        ],
+    );
 
     do_thing(
         x,
@@ -99,22 +108,28 @@ fn combine_blocklike() {
 }
 
 fn combine_struct_sample() {
-    let identity = verify(&ctx, VerifyLogin {
-        type_: LoginType::Username,
-        username: args.username.clone(),
-        password: Some(args.password.clone()),
-        domain: None,
-    })?;
+    let identity = verify(
+        &ctx,
+        VerifyLogin {
+            type_: LoginType::Username,
+            username: args.username.clone(),
+            password: Some(args.password.clone()),
+            domain: None,
+        },
+    )?;
 }
 
 fn combine_macro_sample() {
     rocket::ignite()
-        .mount("/", routes![
-            http::auth::login,
-            http::auth::logout,
-            http::cors::options,
-            http::action::dance,
-            http::action::sleep,
-        ])
+        .mount(
+            "/",
+            routes![
+                http::auth::login,
+                http::auth::logout,
+                http::cors::options,
+                http::action::dance,
+                http::action::sleep,
+            ],
+        )
         .launch();
 }