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The prepended semicolon breaks code (such as jQuery) that looks like:
foo = foo ? foo :
this.location;
I think the reason we started inserting the semicolon was because in situations like:
x = 1 + 2
this.location = "foo"
we used to rewrite to:
x = 1 + 2
(this && this._WB_wombat_obj_proxy || this).location = "foo"
which the browser would interpret as a bogus function call like `2(this && ... )`.
But nowadays prepending the semicolon should be unnecessary as we currently rewrite to:
x = 2 + 3
_____WB$wombat$check$this$function_____(this).location = "foo"
which will trigger JavaScript's automatic semicolon insertion rules like the original code does.