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Originally Posted by meynaf
It is not wrong notions. It is 30+ years of coding.
That some "official" online doc says something does not change what is correct and what is not (btw. Freescale isn't Motorola as we knew it).
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That online doc is the PDF version of the Motorola's M68000 Family Programmer's Reference Manual. For the record, I have the physical book right here, and I can guarantee that the text matches 100%. FreeScale and NXP simply acquired the assets and rights, but didn't redefine the syntax.
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No. Most, if not all, disassemblers, will output it without a size and all assemblers accept it without a size -- while you may eventually find some which reject moveq.l (and bset.b, etc).
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What assemblers and disassemblers do mean less than 0: Motorola defined the syntax, and Motorola said that moveq has a long size.
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If assemblers rejected all 'wrong' syntax with this definition, not a single source in the world would assemble 
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That doesn't change the fact that a wrong syntax is just that: wrong.