{"ast_node_type":"variable","tokens":[{"end":85,"kind":"keyword","start":0,"text":"let"}]}
    let token = ctx.find_token_syntax_at_offset(STRING).and_then(ast::String::cast)?;
pub(crate) fn replace_string_with_char(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()> {
    let value = token.value().ok()?;