callExpr :: Parser Expression
callExpr = parens $ do
  rator <- expression
  rand <- many expression
  return $ CallExpr rator rand

-- | TryExpr ::= try Expression catch (Identifier) Expression
callExpr :: Parser Expression
callExpr = parens $ do
  rator <- expression
  rand <- many expression
  return $ CallExpr rator rand

-- | TryExpr ::= try Expression catch (Identifier) Expression
callExpr = parens $ do
  rator <- expression
  rand <- many expression
  return $ CallExpr rator rand

-- | TryExpr ::= try Expression catch (Identifier) Expression