Problems reported:

parser/error_recovery/issue_44785.crash:2:17: Binary operator 'or' is written as '||' instead of the written out word.
  if (a == null or b == null){
                ^^

parser/error_recovery/issue_44785.crash:3:12: Expected ';' after this.
    return null
           ^^^^

parser/error_recovery/issue_44785.crash:8:17: Binary operator 'and' is written as '&&' instead of the written out word.
  if (a == null and b == null){
                ^^^

parser/error_recovery/issue_44785.crash:9:12: Expected ';' after this.
    return null
           ^^^^

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