bug#15294: 24.3.50; js2-mode parser is several times slower in lexical-binding mode

[Dmitry Gutov]

On 10.09.2013 05:04, Stefan Monnier wrote:
> If it indeed comes from the handling of catch/throw, then there are two
> ways to fix it:
> - ...
> - improve the byte-compiler so it can compile away cl-block/cl-return.
>    This should not require new byte-codes, but requires delving "deepish"
>    into the byte-compiler.

This would take care of `cl-block' wrappers, but it would do nothing 
about explicit uses of `catch', right?