SOURCE_FILE
  FN
    FN_KW "fn"
    WHITESPACE " "
    NAME
      IDENT "a"
    PARAM_LIST
      L_PAREN "("
      R_PAREN ")"
    WHITESPACE " "
    BLOCK_EXPR
      STMT_LIST
        L_CURLY "{"
        WHITESPACE " "
        EXPR_STMT
          ARRAY_EXPR
            L_BRACK "["
            LITERAL
              INT_NUMBER "1"
            COMMA ","
            WHITESPACE " "
            LITERAL
              INT_NUMBER "2"
            COMMA ","
            WHITESPACE " "
            ERROR
              AT "@"
        ERROR
          COMMA ","
        WHITESPACE " "
        STRUCT
          STRUCT_KW "struct"
          ERROR
            COMMA ","
        WHITESPACE " "
        LET_STMT
          LET_KW "let"
          ERROR
            R_BRACK "]"
        WHITESPACE " "
        R_CURLY "}"
  WHITESPACE "\n"
  FN
    FN_KW "fn"
    WHITESPACE " "
    NAME
      IDENT "b"
    PARAM_LIST
      L_PAREN "("
      R_PAREN ")"
    WHITESPACE " "
    BLOCK_EXPR
      STMT_LIST
        L_CURLY "{"
        WHITESPACE " "
        EXPR_STMT
          CALL_EXPR
            PATH_EXPR
              PATH
                PATH_SEGMENT
                  NAME_REF
                    IDENT "foo"
            ARG_LIST
              L_PAREN "("
              LITERAL
                INT_NUMBER "1"
              COMMA ","
              WHITESPACE " "
              LITERAL
                INT_NUMBER "2"
              COMMA ","
              WHITESPACE " "
              ERROR
                AT "@"
        ERROR
          COMMA ","
        WHITESPACE " "
        IMPL
          IMPL_KW "impl"
        ERROR
          COMMA ","
        WHITESPACE " "
        LET_STMT
          LET_KW "let"
        ERROR
          R_PAREN ")"
        WHITESPACE " "
        R_CURLY "}"
  WHITESPACE "\n"
  FN
    FN_KW "fn"
    WHITESPACE " "
    NAME
      IDENT "c"
    PARAM_LIST
      L_PAREN "("
      R_PAREN ")"
    WHITESPACE " "
    BLOCK_EXPR
      STMT_LIST
        L_CURLY "{"
        WHITESPACE " "
        EXPR_STMT
          METHOD_CALL_EXPR
            PATH_EXPR
              PATH
                PATH_SEGMENT
                  NAME_REF
                    IDENT "foo"
            DOT "."
            NAME_REF
              IDENT "bar"
            ARG_LIST
              L_PAREN "("
              LITERAL
                INT_NUMBER "1"
              COMMA ","
              WHITESPACE " "
              LITERAL
                INT_NUMBER "2"
              COMMA ","
              WHITESPACE " "
              ERROR
                AT "@"
        ERROR
          COMMA ","
        WHITESPACE " "
        ERROR
          R_BRACK "]"
        ERROR
          COMMA ","
        WHITESPACE " "
        TRAIT
          TRAIT_KW "trait"
          ERROR
            COMMA ","
        WHITESPACE " "
        LET_STMT
          LET_KW "let"
        ERROR
          R_PAREN ")"
        WHITESPACE " "
        R_CURLY "}"
  WHITESPACE "\n"
error 16: expected expression
error 17: expected R_BRACK
error 17: expected SEMICOLON
error 17: expected expression
error 25: expected a name
error 26: expected `;`, `{`, or `(`
error 30: expected pattern
error 31: expected SEMICOLON
error 53: expected expression
error 54: expected SEMICOLON
error 54: expected expression
error 60: expected type
error 60: expected `{`
error 60: expected expression
error 65: expected pattern
error 65: expected SEMICOLON
error 65: expected expression
error 92: expected expression
error 93: expected SEMICOLON
error 93: expected expression
error 95: expected expression
error 96: expected expression
error 103: expected a name
error 104: expected `{`
error 108: expected pattern
error 108: expected SEMICOLON
error 108: expected expression