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Don't change sequences that influence lexical binding in calls

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Fixes #782
This commit is contained in:
Richard van Velzen
2015-08-25 10:53:35 +02:00
parent 6c8db6eae1
commit e3bd223dac
2 changed files with 28 additions and 9 deletions
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14
lib/compress.js
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@@ -1910,15 +1910,11 @@ merge(Compressor.prototype, {
if (!compressor.option("side_effects"))
return self;
if (!self.car.has_side_effects(compressor)) {
// we shouldn't compress (1,eval)(something) to
// eval(something) because that changes the meaning of
// eval (becomes lexical instead of global).
var p;
if (!(self.cdr instanceof AST_SymbolRef
&& self.cdr.name == "eval"
&& self.cdr.undeclared()
&& (p = compressor.parent()) instanceof AST_Call
&& p.expression === self)) {
// we shouldn't compress (1,func)(something) to
// func(something) because that changes the meaning of
// the func (becomes lexical instead of global).
var p = compressor.parent();
if (!(p instanceof AST_Call && p.expression === self)) {
return self.cdr;
}
}