Matthias Krüger f8f67b2969 Rollup merge of #126883 - dtolnay:breakvalue, r=fmease ... Parenthesize break values containing leading label The AST pretty printer previously produced invalid syntax in the case of `break` expressions with a value that begins with a loop or block label. ```rust macro_rules! expr { ($e:expr) => { $e }; } fn main() { loop { break expr!('a: loop { break 'a 1; } + 1); }; } ``` `rustc -Zunpretty=expanded main.rs `: ```console #![feature(prelude_import)] #![no_std] #[prelude_import] use ::std::prelude::rust_2015::*; #[macro_use] extern crate std; macro_rules! expr { ($e:expr) => { $e }; } fn main() { loop { break 'a: loop { break 'a 1; } + 1; }; } ``` The expanded code is not valid Rust syntax. Printing invalid syntax is bad because it blocks `cargo expand` from being able to format the output as Rust syntax using rustfmt. ```console error: parentheses are required around this expression to avoid confusion with a labeled break expression --> <anon>:9:26 | 9 | fn main() { loop { break 'a: loop { break 'a 1; } + 1; }; } | ^^^^^^^^^^^^^^^^^^^^^^^^ | help: wrap the expression in parentheses | 9 | fn main() { loop { break ('a: loop { break 'a 1; }) + 1; }; } | + + ``` This PR updates the AST pretty-printer to insert parentheses around the value of a `break` expression as required to avoid this edge case.		2024-07-02 17:47:45 +02:00
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src	Rollup merge of #126883 - dtolnay:breakvalue, r=fmease	2024-07-02 17:47:45 +02:00
Cargo.toml	bump itertools to 0.12	2024-03-08 12:34:05 +03:00