Rustfmt generated unaligned indent code block

[A4-Tacks]

Summary

I tried to format this code:

fn main() {
    {
        _ = if let Some(term_node) = sema
            .token_ancestors_with_macros(token.clone())
            .find(|node| {
                matches!(
                    node.kind(),
                    BLOCK_EXPR | ARG_LIST | PAREN_EXPR | ARRAY_EXPR | MATCH_EXPR
                )
            }) {
            match term_node.kind() {}
        };
    }
}

Expected behavior

fn main() {
    {
        _ = if let Some(term_node) = sema
            .token_ancestors_with_macros(token.clone())
            .find(|node| {
                matches!(
                    node.kind(),
                    BLOCK_EXPR | ARG_LIST | PAREN_EXPR | ARRAY_EXPR | MATCH_EXPR
                )
            })
        {
            match term_node.kind() {}
        };
    }
}

Actual behavior

Referece Summary is formatted code

Configuration

rustfmt cli options used (if applicable):

$ rustfmt < foo.rs

rustfmt configuration file (e.g. rustfmt.toml, if applicable):

Reproduction Steps

1. Run cli

Meta

rustfmt --version:

rustfmt 1.9.0-nightly (36ba2c7712 2026-04-23)

[ytmimi]

Based on my reading of the style guide on control flow expressions I think your expectation is correct

[A4-Tacks]

Your example has aligned parentheses, while my example has misaligned parentheses

Where the initial clause spans multiple lines and ends with one or more closing parentheses, square brackets, or braces, and there is nothing else on that line, and that line is not indented beyond the indent on the first line of the control flow expression, then put the opening brace of the block on the same line with a preceding space.

Note that the current output violates 'and that line is not indented beyond the indent on the first line of the control flow expression',