MODULE@0..15
  VAR_DECL@0..14
    IDENT@0..3 "let"
    WHITESPACE@3..4 " "
    DECLARATOR@4..13
      SINGLE_PATTERN@4..5
        NAME@4..5
          IDENT@4..5 "a"
      WHITESPACE@5..6 " "
      EQ@6..7 "="
      WHITESPACE@7..8 " "
      NAME_REF@8..13
        IDENT@8..13 "async"
    SEMICOLON@13..14 ";"
  WHITESPACE@14..15 "\n"