[GROOVY-1068] setDelegate doesn't work when 'def' is used - ASF JIRA

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//demo.groovy
def c = {
def x;
println x;
}
c.setDelegate(x:'hello');
c();

The output is 'null'.

//demo2.groovy
def c = {
//def x;
println x;
}
c.setDelegate(x:'hello');
c();

the output is 'hello'.

Moreover,
class Test {
static main(args) {
def c = {
def x;
println "x:${x}"
}
c.setDelegate(x:'hello')
c()
}
}

The output is 'x:null'

We can't remove 'def x' from Test class, otherwise, there is syntax error in this class(The variable x is undefined in the current scope).