code: func (p *Parser) parseShowDiagnosticsStatement() (*ShowDiagnosticsStatement, error) {
  	stmt := &ShowDiagnosticsStatement{}
  	var err error
  
  	if tok, _, _ := p.ScanIgnoreWhitespace(); tok == FOR {
  		stmt.Module, err = p.parseString()
  	} else {
  		p.Unscan()
  	}
  
  	return stmt, err
  }
docs: // parseShowDiagnostics parses a string and returns a ShowDiagnosticsStatement.