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Add limiation on M_EMPTY_P

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Patrick Pelissier committed 2020-12-31 00:12:36 +01:00
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@@ -5468,6 +5468,10 @@ Return 1 if the argument 'expression' is 'empty', 0 otherwise.
Return a pre-processing token corresponding to this value (meaning it is evaluated Return a pre-processing token corresponding to this value (meaning it is evaluated
at macro processing stage, not at compiler stage). at macro processing stage, not at compiler stage).
NOTE: It should work for a wide range of inputs
except when it is called with a macro function that takes
more than one argument (in which case it generates a compiler error).
##### M\_DEFERRED\_COMMA ##### M\_DEFERRED\_COMMA
Return a comma ',' at a later phase of the macro processing steps. Return a comma ',' at a later phase of the macro processing steps.