RosettaCodeData/Task/Comments/M4/comments-1.m4

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eval(2*3) # eval(2*3) "#" and text after it aren't processed but passed along
dnl this text completely disappears, including the new line
divert(-1)
Everything diverted to -1 is processed but the output is discarded.
A comment could take this form as long as no macro names are used.
divert