Cfn-python-lint: Used Parameter reported as unused

[vandmo]

cfn-lint version: 0.7.3

Not sure if AWS::Serverless is supported but if it is then this template produces an incorrect warning:

AWSTemplateFormatVersion: '2010-09-09'
Transform: 'AWS::Serverless-2016-10-31'
Parameters:
  Version:
    Type: String

Globals:
  Function:
    CodeUri:
      Bucket: "somebucket"
      Key: !Sub "lambda/code/lambda-${Version}-shaded.jar"

Resources:
  SomeLambda:
    Type: 'AWS::Serverless::Function'
    Properties:
      Handler: com.SomeLambda::handleRequest
      Runtime: java8
      MemorySize: 256

Output from cfn-lint:

W2001 Parameter Version not used.
bug.yaml:4:3

[kddejong]

thanks. Looking into this one. We do process the transform before doing any rule checking. Since globals gets removed it looks like we lose the variable usage.

I should be able to come up with some fix for this but thinking through the best way to do it.