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traceon(...)
traceoff(...)

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define(`foo', `Hello World.')
⇒
define(`echo', `$@')
⇒
traceon(`foo', `echo')
⇒
foo
error→m4trace: -1- foo -> `Hello World.'
⇒Hello World.
echo(gnus, and gnats)
error→m4trace: -1- echo(`gnus', `and gnats') -> ``gnus',`and gnats''
⇒gnus,and gnats

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