Annex C (informative) Compatibility [diff]

C.6 C standard library [diff.library]

C.6.2 Modifications to definitions [diff.mods.to.definitions]

C.6.2.3 Header <assert.h> [diff.header.assert.h]

The token static_­assert is a keyword in this International Standard ([lex.key]).
It does not appear as a macro name defined in <cassert> ([cassert.syn]).