Use correct width for subexpr_list

Author: topecongiro

src/chains.rs

@@ -233,6 +233,7 @@ pub fn rewrite_chain(expr: &ast::Expr, context: &RewriteContext, shape: Shape) -
         connector.as_str()
     };
 
+    let subexpr_num = subexpr_list.len();
     let result = if is_small_parent && rewrites.len() > 1 {
         let second_connector = choose_first_connector(
             context,

tests/source/expr-block.rs

@@ -282,3 +282,7 @@ fn issue_1862() {
         /* com */ this_last_arg_is_tooooooooooooooooooooooooooooooooo_long_to_be_kept_with_the_pre_comment ,
     )
 }
+
+fn issue_1878() {
+    let channel: &str = seq.next_element()?.ok_or_else(|| de::Error::invalid_length(2, &self))?;
+}

tests/target/expr-block.rs

@@ -333,3 +333,8 @@ fn issue_1862() {
         this_last_arg_is_tooooooooooooooooooooooooooooooooo_long_to_be_kept_with_the_pre_comment,
     )
 }
+
+fn issue_1878() {
+    let channel: &str = seq.next_element()?
+        .ok_or_else(|| de::Error::invalid_length(2, &self))?;
+}