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http://repo.or.cz/nasm.git/blob/ef7d18bfbb899fe8e44f4fae8d6a12e2742f69f5:/doc/nasmdoc.src#l3350 3351 3352 Context fall-through lookup (automatic searching of outer contexts) 3353 is a feature that was added in NASM version 0.98.03. Unfortunately, 3354 this feature is unintuitive and can result in buggy code that would 3355 have otherwise been prevented by NASM's error reporting. As a result, 3356 this feature has been \e{deprecated}. NASM version 2.09 will issue a 3357 warning when usage of this \e{deprecated} feature is detected. Starting 3358 with NASM version 2.10, usage of this \e{deprecated} feature will simply 3359 result in an \e{expression syntax error}. 3360 I think that depending on the status of the preprocessor's handling, this either should be updated to note that current versions do no longer support this, or the version number for the future version that'll drop support should be updated.