Declarative Pipeline - Variables and functions are no longer binding in a when/expression since version 1.1

[Erik Serating]

So this was working fine before Pipeline Model Definition version 1.1.

==============================

#!/usr/bin/env groovy

def SKIP_BUILD = false

pipeline {

    stages {

        stage('build') {

            when {

                expression {

                    return !SKIP_BUILD

                }

            }

            steps {

               echo "Do build work here."

                

            }

        }

    }

}

================================

In version 1.0.1 the variable "SKIP_BUILD" was bound correctly and the expression could properly evaluate it.

As of version 1.1 (and still in 1.1.4) this results in 

groovy.lang.MissingPropertyException: No such property: SKIP_BUILD for class: groovy.lang.Binding
	at groovy.lang.Binding.getVariable(Binding.java:63)

Same issue if I was trying to use a function in an expression, it used to work now it does not bind. Both bind fine outside of the expression block.

Any ideas on this? Is there a bug filed for this issue?

Thanks,

Erik