Peculiar errors thrown by dart vm and firefox in CI build

[native-api]

A tiny Go code fails only on Travis CI for Linux

If something works locally but not in Travis, there are differences between your local environment and Travis. Find out what this error message means and dig from there – only that can tell what the cause is and point to the discrepancy.

Since those definitely are intended to be invalid directives, I reckon you have disabled those warnings locally.

These message also have nothing to do with the actual failure as you can see if you look at the log closely.