# line numbers...
<Macro foo $where>
  Warning "macro foo(:2) line 1 ($where)"
</Macro>
<Macro bla $where>
  Warning "macro bla(:5) line 1 ($where)"
  Use foo "bla line 2"
</Macro>
Use foo "file line 9"
Use bla "file line 10"
Error "done line 11."