Improve error message when bicep array syntax is wrong

[fgheysels]

I just tried to deploy an Azure resource (keyvault access policy) using bicep. As a new user of bicep, I used the wrong array-syntax to declare the allowed permissions to the KeyVault in my bicep template.
Instead of specifying the array on multiple lines as stated in the documentation, I used comma's to separate the elements, like this:

permissions:
  secrets: ['list', 'get']

Instead of the correct syntax:

permissions:
  secrets: [
     'list' 
     'get'
  ]

My mistake offcourse, but it took me a while before I found the issue, as the error that was given during deployment was this:

Error BCP018: Expected the "}" character at this location.

It would be nice to have a more descriptive error in case somebody declares an array the wrong way in bicep.

[alex-frankel]

Coincidentally, we just merged a fix to resolve this issue with #4956 and it should be available in the next release. Going to close this for now.