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Don't allow positional module mixin arguments.

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Natalie Weizenbaum 2016-03-04 15:57:46 -08:00
parent 5c083237d1
commit 46beceff62
2 changed files with 11 additions and 2 deletions
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2
CHANGELOG.md
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@ -13,6 +13,8 @@
Downstream modules inherently share the same semantics for selector names, and
extensions are an aspect of those semantics.
* Don't allow module mixin arguments to be passed by position.
## Draft 1
* Initial draft.

11
README.md
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@ -735,8 +735,15 @@ file's namespace.
The module mixin's arguments are derived from the module's members (which we can
determine without executing the module). For every variable in module that has a
`!default` flag, the module mixin has an argument with the same name and a
default value of `null`. These arguments are in the order the variables are
defined, although users should be strongly encouraged to only pass them by name.
default value of `null`. The mixin does not allow positional arguments, nor does
it allow named arguments that are not derived from variables.
> **Design note**:
>
> It may become useful to provide the ability to customize the behavior of
> module mixins at the language level. It may be wise to define a convention for
> reserved argument names so that we can add arguments to all module mixins in
> the future. It's not clear what a good convention would be for this, though.
When this mixin is included: