if let Some(extension_string) = get_hint_if_single_char_arg(cx, &args[0], &mut applicability) {
let base_string_snippet =
snippet_with_applicability(cx, receiver.span.source_callsite(), "..", &mut applicability);
- let sugg = format!("{}.push({})", base_string_snippet, extension_string);
+ let sugg = format!("{base_string_snippet}.push({extension_string})");
span_lint_and_sugg(
cx,
SINGLE_CHAR_ADD_STR,