rustfmt fails to format line containing long string literal

[bombless]

fn foo() {
    bar.baz({

dbg!("0123456789abcdef1123456789abcdef2123456789abcdef3123456789abcdef4123456789abcdef5123456")


});
}

for some reason rustfmt fails to format this code, while prettyplease can format it fine

I tested v1.6.0 and nightly, they all failed, so doesn't look like a new bug

[jieyouxu]

The extra newlines are irrelevant,

fn foo() {
    bar.baz({
dbg!("0123456789abcdef1123456789abcdef2123456789abcdef3123456789abcdef4123456789abcdef5123456")
});
}

The string literal length matters, if I chop off 4 charactes from the string literal, it formats

fn foo() {
    bar.baz({
        dbg!("456789abcdef1123456789abcdef2123456789abcdef3123456789abcdef4123456789abcdef5123456")
    });
}

[jieyouxu]

I suspect this is another instance of all-or-nothing fallback behavior, likely related to #6634 (comment).

[JohnDowson]

I believe #3863 is the oldest issue for this bug

[ytmimi]

Yeah, this is definitely a duplicate of #3863