Clarification regarding Completion Records
a.d.bergi at web.de
Fri Sep 23 07:32:59 UTC 2016
Felix Kling wrote:
> I need some clarification around completion records.
You'll want to have a look at the algorithmic conventions
and the implicit coercion of completion values
| Calls to abstract operations return Completion Records.
| The algorithms of this specification often implicitly return
| Completion Records whose [[Type]] is normal. Unless it is otherwise
| obvious from the context, an algorithm statement that returns a value
| that is not a Completion Record, such as:
| > Return "Infinity".
| means the same thing as:
| > Return NormalCompletion("Infinity").
| However, if the value expression of a “return” statement is a
| Completion Record construction literal, the resulting Completion
| Record is returned. If the value expression is a call to an abstract
| operation, the “return” statement simply returns the Completion
| Record produced by the abstract operation.
Yes, it's a bit sloppy, but makes the spec much more readable. It's
already technical enough, so this does formally apply some common sense :-)
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