SOURCE_FILE
  FN
    FN_KW "fn"
    WHITESPACE " "
    NAME
      IDENT "foo"
    PARAM_LIST
      L_PAREN "("
      R_PAREN ")"
    WHITESPACE " "
    BLOCK_EXPR
      STMT_LIST
        L_CURLY "{"
        WHITESPACE " "
        LET_STMT
          LET_KW "let"
          WHITESPACE " "
          IDENT_PAT
            NAME
              IDENT "r#struct"
          WHITESPACE " "
          EQ "="
          WHITESPACE " "
          LITERAL
            INT_NUMBER "92"
          SEMICOLON ";"
        WHITESPACE " "
        LET_STMT
          LET_KW "let"
          WHITESPACE " "
          IDENT_PAT
            NAME
              IDENT "r#trait"
          WHITESPACE " "
          EQ "="
          WHITESPACE " "
          BIN_EXPR
            PATH_EXPR
              PATH
                PATH_SEGMENT
                  NAME_REF
                    IDENT "r#struct"
            WHITESPACE " "
            STAR "*"
            WHITESPACE " "
            LITERAL
              INT_NUMBER "2"
          SEMICOLON ";"
        WHITESPACE " "
        R_CURLY "}"
