Groovy code works, Then in Jenkins it doesn't. How can I make this work? - jenkins

Question

I am trying to augment the 'load' pipeline step function and I keep getting an error. I have found the code it executes based on the stack trace but I can't for the life of me figure out why it wouldn't just call the code as written.
I have written lots-and-lots of Java code so I know what it's trying to do. I just don't understand why it's trying to do it or how to convince it to stop! The groovy sample works perfectly! BTW: if there is an idiomatic way to do this in groovy/jenkins, I am all in.
Jenkins version: 2.176.1
Groovy plugin: 2.2
test.groovy
def someFunction(def params){
println("someFunction ${params}")
}
def someFunction2(def params){
println("someFunction2 ${params}")
}
def mainFunc(def stuff){
}
def somemainThingrunFunmain(){
}
def ___cps___21685(){
}
def ___cps___21688(){
}
this
main.groovy
def loaded = evaluate('test.groovy' as File)
def toAugment = loaded.class.declaredMethods*.name.findAll { !(it =~ '^(main|run)$|^[$]|^(___cps___)') }
def proxy = new Script(this.binding) {
#Override
Object run() {
monad.run()
}
}
toAugment.each {
proxy.metaClass."${it}" = { "logging ${it}".tap { println(it)} } >> loaded.&"${it}"
}
proxy.someFunction('hello world1')
proxy.someFunction2('hello world2')
outputs:
called
someFunction hello world1
called
someFunction2 hello world2
Now in Jenkins:
Jenkinsfile:
library 'common-libraries#chb0'
node('java') {
stage('SCM') {
checkout scm
}
def loaded = load('test.groovy')
stage('experiment') {
loaded.someFunction('hello world1')
loaded.someFunction2('hello world2')
}
}
adapted library (in common-library:vars/load.groovy):
def call(String path) {
def loaded = steps.load(path)
def proxy = new Script(this.getBinding()) { // error here
#Override
Object run() {
loaded.run()
}
}
// remove groovy and jenkins generated functions. Don't touch those
def toAugment = loaded.class.declaredMethods*.name.findAll { !(it =~ '^(main|run)$|^[$]|^(___cps___)') }
toAugment.each {
proxy.metaClass."${it}" = { "logging ${it}".tap { println(it) } } >> loaded.&"${it}"
}
}
exception:
groovy.lang.GroovyRuntimeException: Could not find matching constructor for: load$1(load, Script1, groovy.lang.Binding)
at groovy.lang.MetaClassImpl.invokeConstructor(MetaClassImpl.java:1732)
at groovy.lang.MetaClassImpl.invokeConstructor(MetaClassImpl.java:1532)
at org.codehaus.groovy.runtime.callsite.MetaClassConstructorSite.callConstructor(MetaClassConstructorSite.java:49)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallConstructor(CallSiteArray.java:60)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:235)
at com.cloudbees.groovy.cps.sandbox.DefaultInvoker.constructorCall(DefaultInvoker.java:25)