JS bytecode executable ""
[   0]    0: GetGlobal dst:reg6, identifier:foo
[  10]       Call dst:reg5, callee:reg6, this_value:Undefined, foo
[  30]       End value:reg5

JS bytecode executable "foo"
[   0]    0: CreateArguments is_immutable:false
[  10]       GetCalleeAndThisFromEnvironment callee:reg6, this_value:reg7, identifier:eval
[  28]       CallDirectEval dst:reg5, callee:reg6, this_value:reg7, eval, arguments:[String("var x = 1")]
[  50]       GetBinding dst:reg6, identifier:Number
[  68]       CallConstruct dst:reg5, callee:reg6, Number, arguments:[Int32(42)]
[  88]       Return value:reg5

JS bytecode executable "eval"
[   0]    0: SetLexicalBinding identifier:x, src:Int32(1)
[  18]       End value:Undefined