Mark implicit macro argument default values as such with an attribute #4010
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This change causes no difference to compiled templates or to macro argument semantics.
Consider the following macro:
```twig
{% macro marco(po, lo = null) %}{% endmacro %}
```
With this change, the `ConstantExpression` for argument `po` will have an attribute `isImplicit`, whose value will be `true`. (Note that `lo` will not have that attribute.)
This allows node visitors to distinguish between arguments that do and those that do not have
explicit default values even if the value is `null`.
This is useful for [static code analysis](twigphp#4003).
For example, a static analysis tool might consider arguments with no explicit default value as non-optional.
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This change causes no difference to compiled templates or to macro argument semantics.
Consider the following macro:
{% macro marco(po, lo = null) %}{% endmacro %}With this change, the
ConstantExpressionfor argumentpowill have an attributeisImplicit, whose value will betrue. (Note thatlowill not have that attribute.)This allows node visitors to distinguish between arguments that do and those that do not have explicit default values even if the value is
null.This is useful for static code analysis.
For example, a static analysis tool might consider arguments with no explicit default value as non-optional.