webidl_binder dumps its stack backtrace when reporting syntax errors

[MarkCallow]

When webidl_binder finds a syntax error, in the .idl file it is processing, it dumps its stack backtrace before finally printing the syntax error message. It is extremely user-unfriendly with 11 (long) lines of irrelevant noise before the 1 line of the syntax error and the echo of the line containing the error.

[stale]

This issue has been automatically marked as stale because there has been no activity in the past year. It will be closed automatically if no further activity occurs in the next 30 days. Feel free to re-open at any time if this issue is still relevant.