Aron Insinga <aki@insinga.com> said:

the DEC PDP-1 MACRO assembler manual says that a macro call
is expanded by copying the *sequence of 'storage words' and
advancing the current location (.) for each word copied*

I am quite surprised.

I looked at the manual and I think he's misreading it. The "words" in
question are the tokens in the macro definition. 

The example macros look pretty straightforward, instructions and
pseudo-ops that are expanded replacing dummy arguments by actual ones.
There's no conditional assembly so each macro is just a parameterized
chunk of code.

https://bitsavers.org/pdf/dec/pdp1/PDP-1_Macro.pdf

R's,
John