Allow usage of bicep code in decorators

[slavizh]

Is your feature request related to a problem? Please describe.
I have the following example:

main.bicep

var defaultValue: {
  test: 'foo1'
}

type foo = {
  @description('Some description. Default value: ${defaultValue.test}')
  property1: 'foo1' | 'foo2'?
}

param foo foo

As you see in VSC the description does not work. That happens when you use bicep code inside description decorator. VSC does not throw any errors on main.bicep so it is expected this to work but in reality it does not.

The scenario here is that I just want to reference those default values as that way I can only have them in once place and upon changing I do not have to change them on multiple times. This is also useful when you have some content that is saved in text files like Kusto queries for which you can just reference that text file instead of adding the whole query all over again.

Describe the solution you'd like
A clear and concise description of what you want to happen.

[jeskew]

This should raise an error diagnostic as of Bicep 0.21.1:

Which version of the VS Code extension is being used?

[slavizh]

@jeskew yeah, seems now I get error. Previously there must be some crash or problem with bicep cli/extension as I was not getting that error but now on re-opened VSC I am getting it. Any chance being able to support that or it is too complex to implement? I am working on a schema for one solution and if needed I can share the code in private to check how UDT are implemented in real world template.

[shenglol]

@slavizh Do you have other scenarios that require this functionality other than just for rendering default values?

[slavizh]

@shenglol not at this point

[shenglol]

Related to #444.