dnl ../doc/m4.texinfo:1607: Origin of test
define(`foo', `Hello World.')
dnl @result{}
define(`echo', `$@')
dnl @result{}
traceon(`foo', `echo')
dnl @result{}
foo
dnl @error{}m4trace: -1- foo -> `Hello World.'
dnl @result{}Hello World.
echo(gnus, and gnats)
dnl @error{}m4trace: -1- echo(`gnus', `and gnats') -> ``gnus',`and gnats''
dnl @result{}gnus,and gnats