`clippy::single_match` suggestion does not compile when the expression contains un-chainable comparison operators

Summary

When using a match statement with an inequality like 1 < 2 and boolean branches, clippy suggests an if statement of the form if 1 < 2 == true which is not legal as the == and < operators cannot be chained and so require parenthesis [source].

Reproducer

Code:

match 1 < 2 {
    true => (),
    false => (),
};

https://rust.godbolt.org/z/eacKdYEds

Current output:

if 1 < 2 == true { () };

https://rust.godbolt.org/z/TfzTz6rT6

Desired output:

if (1 < 2) == true { () };

or

if 1 < 2 { () };

Version

rustc 1.98.1 (48a229cea 2026-09-01)
binary: rustc
commit-hash: 48a229ceaefd4985c50990b14116b6d856af0985
commit-date: 2026-09-01
host: x86_64-unknown-linux-gnu
release: 1.98.1
LLVM version: 22.1.8

Additional Labels

@rustbot label +I-suggestion-causes-error

Locate the implementation and tests for clippy::single_match; begin by reproducing the reported match expression and inspecting how its suggestion is built. Done means the suggested if expression is valid Rust for the inequality case while preserving the intended behavior; run the relevant Clippy tests.