tests/source/configs-fn_call_style-visual-trailing-comma.rs

// rustfmt-error_on_line_overflow: false
// rustfmt-fn_call_style: Visual

// rustfmt should not add trailing comma when rewriting macro. See #1528.
fn a() {
    panic!("this is a long string that goes past the maximum line length causing rustfmt to insert a comma here:");
}