When adding to an entry to a set of automatically generated define values s_all does not handle the following two cases, nor does it issue an error.

• Defining a symbol without value. The define will be moved to the correct lexicographically sorted location but no value will be generated for that define however the value will be skipped.

  #define A 1
  #define C 2
  #define B
  // Is transformed to
  #define A 1
  #define B
  #define C 4
  

• Defining a symbol with a value of zero.

  #define A 1
  #define C 2
  #define B 0
  // Is transformed to
  #define A 1
  #define B 0
  #define C 4