================================================================================
nil literal
================================================================================

nil

--------------------------------------------------------------------------------

(source_file
  (nil_literal))

================================================================================
Integer literal
================================================================================

42

--------------------------------------------------------------------------------

(source_file
  (integer_literal))

================================================================================
String literal
================================================================================

"Hello World!"

--------------------------------------------------------------------------------

(source_file
  (string_literal))

================================================================================
String literal special character escapes
================================================================================

"Hello\nWorld!"

--------------------------------------------------------------------------------

(source_file
  (string_literal
    (escape_sequence)))

================================================================================
String literal octal
================================================================================

"Hello World\041"

--------------------------------------------------------------------------------

(source_file
  (string_literal
    (escape_sequence)))

================================================================================
String literal hex
================================================================================

"Hello World\x21"

--------------------------------------------------------------------------------

(source_file
  (string_literal
    (escape_sequence)))

================================================================================
String literal character escapes
================================================================================

"Hello\\\"World\""

--------------------------------------------------------------------------------

(source_file
  (string_literal
    (escape_sequence)
    (escape_sequence)
    (escape_sequence)))

================================================================================
Unterminated string literal
================================================================================

"

--------------------------------------------------------------------------------

(source_file
  (string_literal
    (MISSING """)))

================================================================================
String literal unterminated escape
================================================================================

"\"

--------------------------------------------------------------------------------

(source_file
  (string_literal
    (escape_sequence)
    (MISSING """)))

================================================================================
String literal invalid octal
================================================================================

"\399"

--------------------------------------------------------------------------------

(source_file
  (ERROR
    (UNEXPECTED '9'))
  (integer_literal)
  (ERROR))