Test AsyncFromSyncIterator methods with undefined
values
#2604
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I've modified existing templates instead of adding new test files because strings as
throw
/return
arguments are already covered a few lines above, and by testingundefined
case we make sure that "is present" check of tc39/ecma262#1776 is implemented correctly. This PR also alignsthrow
andreturn
templates withnext
, which already coversundefined
case.Follow-up of #2571.
JSC bug: AsyncFromSyncIterator methods should not pass absent values.