Annex D (normative) Compatibility features [depr]

D.12 Deprecated C macros [depr.c.macros]

1
#
The header <stdalign.h> has the following macro:
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#define __alignas_is_defined 1
2
#
The header <stdbool.h> has the following macro:
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#define __bool_true_false_are_defined 1