time macro fails to expand with macroexpand-all when nested

[ikappaki]

Hi,

the basilisp.core/time macro uses a straight start let binding referenced in a try-catch block and as such is susceptible to errors when expanded by macroexpand-all (see #1142)

To reproduce

• In the REPL create use time in a new macro definition and try to expand it with macroexpand-all, an error is thrown complaining about the start binding:

basilisp.user=> (require '[basilisp.walk :refer [macroexpand-all]])
nil
basilisp.user=> (defmacro abc [] `(time 5))
#'basilisp.user/abc
basilisp.user=> (macroexpand-all '(abc))

  exception: <class 'basilisp.lang.compiler.exception.CompilerException'>
      phase: :analyzing
    message: unable to resolve symbol 'basilisp.core/start' in this context
       form: basilisp.core/start
   location: <Macroexpand>:NO_SOURCE_LINE

I believe the intention here was to use an auto-gensym all along.

Patch to follow.

Thanks

[chrisrink10]

Fixed in #1144