@laysauchoa take a look at matches#rewrite_match_body. It should be enough to check if the arm body is an empty block, which is resolved here:

rustfmt/rustfmt-core/rustfmt-lib/src/matches.rs

Lines 360 to 362 in 99edc88

    
           ); 
        
           let (is_block, is_empty_block) = if let ast::ExprKind::Block(ref block, _) = body.kind { 
        
               (true, is_empty_block(context, block, Some(&body.attrs)))

And if so, rewrite the original arm body with (), maybe in the combine_orig_body closure which is one method responsible for formatting the rewritten arm body:

rustfmt/rustfmt-core/rustfmt-lib/src/matches.rs

Lines 370 to 377 in 99edc88

    
           let combine_orig_body = |body_str: &str| { 
        
               let block_sep = match context.config.control_brace_style() { 
        
                   ControlBraceStyle::AlwaysNextLine if is_block => alt_block_sep, 
        
                   _ => " ", 
        
               }; 
        
               Some(format!("{} =>{}{}{}", pats_str, block_sep, body_str, comma)) 
        
           };

Or something like that..

	);
	let (is_block, is_empty_block) = if let ast::ExprKind::Block(ref block, _) = body.kind {
	(true, is_empty_block(context, block, Some(&body.attrs)))

	let combine_orig_body = \|body_str: &str\| {
	let block_sep = match context.config.control_brace_style() {
	ControlBraceStyle::AlwaysNextLine if is_block => alt_block_sep,
	_ => " ",
	};

	Some(format!("{} =>{}{}{}", pats_str, block_sep, body_str, comma))
	};

Empty match arms #4065

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