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$ cat test.asm mov al, byte [ bx ] mov al, [ bx ] $ nasm -v NASM version 2.15rc0 compiled on Dec 28 2018 $ nasm test.asm test.asm:1: error: comma, colon, decorator or end of line expected after operand $ (cd ../nasm/ && git describe) nasm-2.14.03rc1-287-ge88f752e $
This is almost certainly due to a missed TOKEN_SIZE conversion.
In nasm-2.14.03rc1 it works as expected.
Fixed in gef4f23d7.