JS bytecode executable ""
[   0]    0: GetLexicalEnvironment dst:reg4
[   8]       GetGlobal dst:reg6, identifier:f
[  18]       Call dst:reg5, callee:reg6, this_value:Undefined, f, arguments:[Int32(1)]
[  40]       End value:reg5

JS bytecode executable "f"
[   0]    0: GetLexicalEnvironment dst:reg4
[   8]       JumpUndefined condition:arg0, true_target:@18, false_target:@40
[  18]    1: Mov dst:arg0, src:<Empty>
[  28]       ThrowIfTDZ src:arg0
[  30]       Mov dst:arg0, src:arg0
[  40]    2: End value:Undefined