Importing from XCode 10.1 Instruments fails

hi,
when I run in command line $ speedscope Instruments3.trace
Error: EISDIR: illegal operation on a directory, read
Usage: speedscope [filepath]
If invoked with no arguments, will open a local copy of speedscope in your default browser.
Once open, you can browse for a profile to import.
If - is used as the filepath, will read from stdin instead.
cat /path/to/profile | speedscope -

if I use browser, got the error below:
Unrecognized format! See documentation about supported formats.

please let me know when you fix it.
Thank you !

The report names the speedscope CLI and browser importer but no source files or tests. Reproduce both commands with the XCode 10.1 Instruments3.trace directory, then trace the supported-format handling; done means the profile imports without the EISDIR or unrecognized-format errors.

Written by the indexing model from the issue text.