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$COMMENT: Generate a comment‘$COMMENT’(string) generates a comment in the output file.
This function is sometimes useful in conjunction with the processing of FWEB macros, since ordinary comments are removed when macros are processed. For example, if one says
@c
@
@m M "abc" $COMMENT("Test")
@a
m = M
the tangled output will be ‘m= "abc"/* Test */’