p Test sorting and filtering of output
+$ true
+
+! output sort
+$ true
+
+$ printf 'profiling: foo\\n'
+
+$ printf 'profiling: foo'
+
+! output sort
+$ printf 'profiling: foo\\n'
+
+! output sort
+$ printf 'profiling: foo'
+
$ printf 'a\\nb\\nc\\nd\\n'
> a
> b